Oil supplying system for an automatic transmission with a hydrodynamic starting device

An oil supply system for an automatic transmission of a motor vehicle comprising:

• at least one oil pump (2) and an oil filter device (3, 31) for conveying oil from an oil sump (4) to:
• a primary oil circuit (6) having a primary pressure adjusted by a main pressure valve (5);
• and
• a secondary oil circuit (7) having a secondary pressure that is a proportion of the primary pressure;
• a variator (9, 10) and at least one shifting element (12, 13) connected with the primary oil circuit (6);
• a lubrication device (28) connected with the secondary oil circuit (7);
• and
• a converter unit (19) Including one of a hydrodynamic torque converter (20) with a converter lock-up clutch (21) and a hydrodynamic clutch with a lock-up clutch;
• the converter unit (19) being connected with a first oil line (23) and with a second oil line (25) connected with the primary oil circuit (6) and the secondary oil circuit (7) such that
• when the converter unit (19) is in a torque transmission state, the lock-up clutch is supplied with a minimum pressure required for torque transmission through the primary oil circuit (6) and the lubrication device (28) is provided with oil through the secondary circuit (7);
• and
• when the converter unit (19) is in the open state, the lock-up clutch is provided with oil through the secondary oil circuit (7).

An oil supply system for an automatic transmission of a motor vehicle comprising:

• at least one oil pump (2) and an oil filter device (3, 31) for conveying oil from an oil sump (4) to:
• a primary oil circuit (6) having a primary pressure adjusted by a main pressure valve (5);
• and
• a secondary oil circuit (7) having a secondary pressure that is a proportion of the primary pressure;
• a variator (9, 10) and at least one shifting element (12, 13) connected with the primary oil circuit (6);
• a lubrication device (28) connected with the secondary oil circuit (7);
• and
• a converter unit (19) including one of a hydrodynamic torque converter (20) with a converter lock-up clutch (21) and a hydrodynamic clutch with a lock-up clutch;
• the converter unit (19) being connected with a first oil line (23) and with a second oil line (25) connected with the primary oil circuit (6) and the secondary oil circuit (7) such that
• when the converter unit (19) is in a torque transmission state, the lock-up clutch is supplied with a minimum pressure required for torque transmission through the primary oil circuit (6) and the lubrication device (28) is provided with oil through the secondary circuit (7);
• when the converter unit (19) is in the open state, the lock-up clutch is provided with oil through the secondary oil circuit (7);
• the converter unit (19) is connected to a converter pressure valve (22) through the first oil line (23),
• the look-up clutch is connected to a converter clutch valve (24) through the second oil line (25), and
• the converter pressure valve (22) and converter clutch valve (24) are interconnected with the first oil circuit (6) and the second oil circuit (7) and are controlled by a pressure shifting valve (40) according to an operating state of the converter unit (19), such that
• the lubricating device (28) is provided with oil from the secondary oil circuit (7), and
• the lock-up clutch is provided with oil from the primary oil circuit (6) when the converter unit (19) is in a torque transmission operating state and with oil from the secondary oil circuit (7) when the converter unit (19) is in an open operating state.