| 摘要 |
<p>PURPOSE:To eliminate the speed change shock and consequently enhance the speed change efficiency by a structure wherein a stand-by means is provided in the hydraulic circuit of a clutch and yet a controlling unit, which brings said stand-by means to joint when the rotations of the two surfaces to be jointed to each other of the clutch synchronizes. CONSTITUTION:A governor valve 3 and the solenoid valve 26 of a stand-by means A are provided in the oil passages of a first and a second clutches 8 and 11 and a speed change controlling unit 25 repsectively. On the other hand, a detection pump 12 to detect the difference between the rotational speeds of the two surfaces to be jointed to each other of the clutch 11 is provided in a synchronous circuit B. Said pump 12 is connected to an oil motor 32 coupled to the fulcrum shaft 38' of an accelerator arm through an oil passage, in which pressure switches 30 and 30' are provided. A controlling circuit C, in which said switches 30 and 30' are contained, controls to change-over the solenoid valve 26 so as to retard the joining of the stand-by means A in response to a combination change signal and to realize said joining under the state that the two surfaces to be jointed to each other of the clutch 11 synchronizes.</p> |
