Heat dissipation method for friction surface of wet clutch of automobile gear box

Abstract

The invention discloses a heat dissipation method for a friction surface of a wet clutch of an automobile gear box. The heat dissipation method is characterized in that cooling oil flows in through a flow-in port along the external diameter of a driven disk and then flows out from an oil flow-out port along the internal diameter of the driven disk through a cooling oil tank; the cooling oil rollsand flows in the cooling oil tank to be mixed fully so as to dissipate heat; the cooling water tank consists of a plurality of grid-shaped oil tanks connected in series; the grid-shaped oil tanks arealternately arranged with higher left and lower right or with lower left and higher right in an interlocking way along the radial direction; and the radial direction refers to the radius direction ofthe driven disk. The method has the advantages that: strong partial turbulent flow is produced in a shear layer of the oil flow at the connecting necking of two adjacent grid-shaped oil tanks so as to enhance the momentum exchange and the energy exchange of the oil flow; the reverse sliding of a driving disk and the driven disk on the friction surface produces the annular flow vertical to the flowing direction of the oil tank, so that the oil at a lower temperature constantly rolls to the friction boundary so as to increase the heat transfer temperature difference; and the high and low alternate arrangement of the cooling oil tanks and the depth variation roll the oil flow and enhance the pulsation of the main flow so as to improve the heat transfer effect.

Description

technical field [0001] The invention belongs to the technical field of automobile gearboxes, and relates to a heat dissipation method for a friction surface when a wet clutch is closed. Background technique [0002] The wet clutch is a device widely used in automobile gearboxes to transmit and cut off torque. It consists of a steel driving disc on the engine side and a driven disc on the output shaft side of the gearbox. The driven disc has a friction lining. Under the working conditions such as starting on a slope, maintaining on a slope, and introducing friction to improve shifting quality, the excessive temperature rise caused by the relative friction between the driving disc and the driven disc will cause the friction material to advance With aging, the cooling oil decomposes, which eventually leads to a decrease in cooling effect and failure of the clutch. Therefore, cooling of the clutch friction surfaces is critical to both its performance and long-term durability. ...

AI Technical Summary

Problems solved by technology

Therefore, in the above-mentioned common oil tank design, the temperature gradient increases with the radius of the oil tank (inner diameter to outer diameter), so the highest temperature usually occurs at the outer diameter of the friction surface, which limits the heat capacity of the clutch and the transmission of torque, which greatly affects the clutch. Durability, Reliability and Efficiency

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