SHARP RAISING MECHANISM FOR WORKING OIL TEMPERATURE FOR AUTOMATIC TRANSMISSION FOR VEHICLE

摘要

PURPOSE:To reduce the power loss on cold start with a simple mechanism by allowing a valve to correspond to a spring made shape memory alloy which is immersed in an oil passage and stopping the inflow into an oil cooler, when the working oil temperature is below a set temperature. CONSTITUTION:Working oil returns from a torque converter and a direct connection clutch controller through an oil passage 12D and flows into an SMA spring 21 part made of shape memory alloy, and when the oil temperature is below a set temperature, e.g., 70 deg.C, the force of a common spring 23 becomes larger than the force of the SMA spring 21, and a valve 22 communicates with the oil passages 12D-20-24-25-18, and is connected to an oil reservoir 1, and an oil passage 13 is closed to suppress the inflow of the working oil into an oil cooler 5. When the working oil temperature is higher than the set temperature, the force of the SMA spring 21 increases beyond that of the common spring 23, and the valve 22 shifts rightward, and the working oil passes through the oil passages 12d-20-24-13-oil cooler 5 and flows into the oil passage 18. Therefore, the responsiveness is improved with the simple mechanism, and the power loss on cold start can be reduced.