192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch
Patent
1991-05-15
1994-04-26
Lorence, Richard M.
192 clutches and power-stop control
Vortex-flow drive and clutch
Including drive-lockup clutch
74467, 747321, F16H 6114
Patent
active
053058623
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a control mechanism for a frictionally engaged lock-up clutch of a hydrodynamic torque converter whose axially displaceable coupling element is pressurizable on its end faces from actuation spaces for engaging and disengaging the lock-up clutch, said actuation spaces being attached via regulating valves to a main pressure system, and including, a lubrication system of a transmission rear-mounted on the torque converter attached to a lubricant line which is connected with a controlled return flow of the actuation space serving for engaging the lock-up clutch, and accommodating a radiator.
BACKGROUND OF THE INVENTION
A control mechanism of the above mentioned kind has been disclosed in DE-OS 31 30 871. Pressurized fluid is optionally fed from the main pressure system of the control mechanism via regulating valves to the actuation spaces of the lock-up clutch so that the lock-up clutch is in an engaged, disengaged, or slipping condition. Attached to a return flow of one of the regulating valves which is optionally connectable with one of the two actuation spaces is the lubricant line which leads via the oil cooler to the lubrication system of the transmission. In the initial phase, when the lock-up clutch is engaged, only a small amount of lubricant from the actuation space serving for disengaging reaches the lubrication points of the transmission via the radiator. A complete collapse of the lubricant pressure, which can result in damage to the transmission, occurs when the control valve of the regulating valve is in its central position so that lubricant cannot reach the lubrication points via the radiator either from the interior of the converter or from the main pressure line.
SUMMARY OF THE INVENTION
Therefore, the invention is based on the problem of preventing said difficulties and developing a control mechanism of the kind mentioned in a manner such that a sufficient amount of lubricant always reaches the lubrication points of the transmission via the radiator.
According to the invention said problem is solved by the fact that a leg of the main pressure line discharges in the lubricant line before reaching the radiator. If as a result of the positions of the regulating valves, the amount of lubricant outcropping on the radiator and on the lubrication points now diminishes, then said leg of the main pressure line feeds the missing amount into the lubricant line. Corresponding conditions can appear when the lock-up clutch is engaged or slip regulated if, in the return flow of the actuation space serving to engage the lock-up clutch, no pressurized fluid is removed.
According to the invention there must be situated in the connecting point of lubricant line and leg of the main pressure line, a pressure-regulating valve, which is pilot controlled with the pressure of the lubricant line. If the pressure increases in the lubricant line, said pressure-regulating valve, in adequate manner, reduces the feeding from the leg of the main pressure line. Therefore, the pressure in the lubricant line can to a great extent be kept constant.
According to the invention a throttle can be situated in the leg of the main pressure line and/or on the exit side of the pressure-regulating valve. These throttles, that are present separately or by pairs, must somewhat reduce the current of pressurized fluid from the main pressure line, since when the lock-up clutch is regulated or closed, there is a lesser flow of pressurized fluid required via the radiator than in pure converter operation in which the pressurized fluid becomes intensively heated.
In addition, according to the invention, in a control mechanism having an electro-magnetic pressure-control valve governed by a control unit which adjusts the pressure in a pilot control line of the regulating valves, each actuation space is coordinated with a regulating valve that adjusts the actuation pressure, both regulating valves being pressurizable by the pilot control pressure, adjusted by the control unit by means of the pressure-control valve. By s
REFERENCES:
patent: 4768632 (1988-09-01), Moan
patent: 4828084 (1989-05-01), Hasegawa et al.
patent: 5090527 (1992-02-01), Imamura et al.
Lorence Richard M.
Zahnradfabrik Friedrichshaften AG
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