In the driving force transmission apparatus for selectively fastened to release the other when they have entered into a one of the first frictional engagement element and the second frictional engagement element, the temperature of the lubricating oil flowing through the respective frictional engagement elements by low temperature sensor to provide a detectable driving force transmission device.
A driving force transmission device to selectively fastened to release the other when they have entered into a one of the forward clutch (31) and the reverse brake (32), the forward clutch (31) and the reverse brake (32) There are disposed inside and outside the double radially overlap in the axial direction, the temperature sensor (9) is arranged on the outer circumference position of the forward clutch (31) and the reverse brake (32), and the reverse brake forward clutch (31) the lubricating oil for cooling the (32), the temperature sensor 9 through the forward clutch from the inside of the forward clutch (31) and the reverse brake (32) and (31) and the reverse brake (32) in the radial direction it was the power transmission device according to claim lubricating oil path (80) is formed throughout.