| 摘要 |
1,105,778. Change-speed control. BORG WARNER CORPORATION. 16 Nov., 1965 [23 Nov., 1964], No. 48660/65. Headings F2C and F2D. In order to cushion gear changing in a hydromechanical vehicle transmission a clutch arranged in series with the hydraulic coupling is disengaged upon a gear shift to break the drive through the coupling, the subsequent reengagement of the clutch being automatically regulated. In the system shown a disc clutch D is connected to the impeller or the turbine of a three-element torque converter C, Figs. 2 and 3 (not shown) and the forward and reverse ratio clutches E of the mechanical gear-box are controlled by a manual selector valve 71 with a rotary arm 73 connected to a pressure supply line 70 and movable over ports 74 connected to clutch supply lines 79. A control valve unit comprises three regulator valves 81, 82, 83 in cascade, the first supplying liquid from line 70 to clutch D through a line 101. A diverter valve 117 is normally held in the position shown to allow pressure liquid from line 70 to pass to the underside of a piston 120 bearing against the underside of the second valve 82 through a loading spring 103 to maintain the clutch supply pressure in line 101. During a gear change the selector arm 73 passes over one of a series of ports 76 between the ratio clutch ports 74 and connected by a line 77 to the underside of diverter valve 117 which is thereby raised against a spring 116a to out off communication between pressure line 70 and piston 120 so that valve 82 operates to disengage the clutch D and thus break the drive to the converter impeller or turbine. Upon completion of a gear shift the rate of return of valve 117 to its normal position, and hence the rate of reengagement of clutch D, is automatically regulated by orifice valves 122, 126 located in line 77 and between valve 117 and piston 120 respectively. The third valve 83 operates to maintain the supply of liquid to the torque converter. |
