| 摘要 |
PURPOSE:To precisely detect the speed of a vehicle, by providing rotational speed sensors for drive output members for rear and front wheels, and by arranging detecting elements therefor at positions, which are separated from each other with one and the same turning radius, and by providing rotors having one and the same radius, in the output members, respectively. CONSTITUTION:Electromagnetic pick-ups 122a, 124a for rear and front rotational speed sensors 122, 124 are arranged near to each other and in parallel with each other, and further, they are fixed to positions that are separated from each other by the radii which are equal to each other from a rotating centers of a ring gear 42 and a clutch drum 62. Further, gear-like concave and convex parts 122b, a ring-like digit tooth member 124 are formed with one and the same radius. Thereby, the rates between rotational speed and circumferential speed thereof may be made to be identical. Therefore, judgment is made on whether the vehicle speed due to the rear wheels is lower than that due to the front wheel or not by directly comparing pulse signals which are delivered from both sensors, respectively, in accordance with the rotation. Accordingly, it is possible to precisely detect the vehicle speed, and to simplify the arrangement of a signal processing device.
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