Apparatus for the operation of a hydrodynamic torque converter and a therewith corresponding converter bypassing clutch of a transmission apparatus

An apparatus (100) for operating a hydrodynamic torque converter (1) and a corresponding converter-bypass clutch (2) of a transmission, the apparatus comprising:

• a solenoid valve (WDV) having a valve stem assembly (WDV_S) with a surface which reacts to a pilot pressure (p_VS), the solenoid valve (WDV) being controlled by the pilot pressure (p_VS) which biases a spring arrangement (WDV_F);
• a variable pressure control valve (WKV) having a valve stem assembly (WKV_S) with a surface which reacts to the pilot pressure (p_VS), the variable pressure control valve (WKV) being controlled by the pilot pressure (p_VS) which biases spring arrangement (WKV_F), the solenoid valve (WDV) and the pressure control valve (WKV) being operably connected;
• the solenoid valve (WDV) and the pressure control valve (WKV) each have a plurality of apertures (WDV_1-WDV_8, WKV_1-WKV_6), and each of the plurality of apertures (WDV_1-WDV_8, WKV_1-WKV_6) communicating with one or more control lines (L1 to L10);
• at least one of the or more of the control lines (L1-L10) communicates with the torque converter (1) and the converter-bypass clutch (2)to apply pressurized hydraulic fluid to end areas of the torque converter (1) and the converter-bypass clutch (2) remote from the plurality of apertures (WDV_1 to WDV_8 WKV_1 to WKV_6);
• a second supply aperture (WDV_2) of the solenoid valve (WDV) is subjected to system pressure (p_sys), via a first control line (L2), and is connected to an input side of the torque converter (1) of the solenoid valve (WDV);
• a surface between a control space (24) of the solenoid valve (WDV), which is connected with the second supply aperture (WDV_2), and a first adjacent active surface (25) of the valve stem assembly (WDV_S) of the solenoid valve (WDV), has a surface area different than a surface between the control space (24) of the solenoid valve (WDV) and a second adjacent active surface (26) of the valve stem assembly (WDV_S) of the solenoid valve (WDV);
• a flow return side of the torque converter (1) communicates with a sixth flow return aperture (WDV_6) of the solenoid valve (WDV), a valve stem assembly associated with the solenoid valve (WDV) is blocked by the second supply aperture (WDV_2) of the solenoid valve (WDV) and communicates with an additional pressure control valve (11);
• a fourth supply aperture (WKV_4), of the variable pressure control valve (WKV), communicates with a third pilot pressure aperture (WKV_3) of the pressure control valve (WKV) which communicates with a piston space (27) of the converter-bypass clutch (2), the third pilot pressure aperture (WKV_3) of the pressure control valve (WKV) communicates with the converter-bypass clutch (2) when the piston space (27) of the converter-bypass clutch (2) is pressurized with hydraulic fluid;
• and
• the third pilot pressure aperture (WKV_3) of the variable pressure controller valve (WKV), upon a valve stem related blockage between the fourth supply aperture (WKV_4) and the third pilot pressure aperture (WKV_3), is connected with a relief aperture (WKV_2) of the variable pressure control valve (WKV).

An apparatus (100) for operating a hydrodynamic torque converter (1) and a corresponding converter-bypass clutch (2) of a transmission, the apparatus comprising:

• a solenoid valve (WDV) having a valve stem assembly (WDV_S) with a surface which reacts to a pilot pressure (p_VS), the solenoid valve (WDV) being controlled by the pilot pressure (p_VS) which biases a spring arrangement (WDV_F);
• a variable pressure control valve (WKV) having a valve stem assembly (WKV_S) with a surface which reacts to the pilot pressure (p_VS), the variable pressure control valve (WKV) being controlled by the pilot pressure (p_VS) which biases spring arrangement (WKV_F), the solenoid valve (WDV) and the pressure control valve (WKV) being operably connected;
• the solenoid valve (WDV) and the pressure control valve (WKV) each have a plurality of apertures (WDV_1-WDV_8, WKV_1-WKV_6), and each of the plurality of apertures (WDV_1-WDV 8, WKV_1-WKV_6) communicating with one or more control lines (L1 to L10);
• at least one of the one or more of the control lines (L1-L10) communicates with the torque converter (1) and the converter-bypass clutch (2) to apply pressurized hydraulic fluid to end areas of the torque converter (1) and the converter-bypass clutch (2) remote from the plurality of apertures (WDV_1 to WDV_8, WKV_1 to WKV_6);
• a second supply aperture (WDV_2) of the solenoid valve (WDV) is subjected to system pressure (p_sys), via a first control line (L2), and is connected to an input side of the torque converter (1) of the solenoid valve (WDV);
• a surface between a control space (24) of the solenoid valve (WDV), which is connected with the second supply aperture (WDV_2), and a first adjacent active surface (25) of the valve stem assembly (WDV_S) of the solenoid valve (WDV), has a surface area different than a surface between the control space (24) of the solenoid valve (WDV) and a second adjacent active surface (26) of the valve stem assembly (WDV_S) of the solenoid valve (WDV);
• a flow return side of the torque converter (1) communicates with a sixth flow return aperture (WDV_6) of the solenoid valve (WDV)I a valve stem assembly associated with the solenoid valve (WDV) is blocked by the second supply aperture (WDV_2) of the solenoid valve (WDV) and communicates with an additional pressure control valve (11);
• a fourth supply aperture (WKV_4), of the variable pressure control valve (WKV), communicates with a third pilot pressure aperture (WKV_3) of the pressure control valve (WKV) which communicates with a piston space (27) of the converter-bypass clutch (2), the third pilot pressure aperture (WKV_3) of the pressure control valve (WKV) communicates with the converter-bypass clutch (2) when the piston space (27) of the converter-bypass clutch (2), is pressurized with hydraulic fluid;
• and
• the solenoid valve (WDV) has an fourth inlet aperture (WDV_4), which is subjected to a supply pressure by a throttle valve (17), the supply pressure being supplied to the second supply aperture (WDV_2) of the solenoid valve (WDV).