Hydraulic control device for lockup clutch
A lock-up clutch, oil pressure control technology, applied in transmission control, manufacturing tools, components with teeth, etc., can solve the problems of vehicle driving performance damage, bubble retention, inability to obtain sufficient transmission torque, etc. The effect of improving drive performance and suppressing reduction in transmission torque
Inactive Publication Date: 2013-08-21
TOYOTA JIDOSHA KK
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Problems solved by technology
[0010] The present invention is made against the background of the above-mentioned situation, and its purpose is to improve the driving performance of the vehicle due to the fact that the air bubbles remain and accumulate in the fluid transmission device when the vehicle is stopped at low oil temperature, and sufficient transmission torque cannot be obtained when starting. Damaged situation
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Embodiment Construction
[0043] Embodiments of the present invention will be described in detail below with reference to the drawings.
[0044] figure 1 It is a configuration diagram illustrating a schematic configuration of a vehicle transmission 8 to which the present invention is preferably applied. The vehicle transmission 8 is preferably used in an FF vehicle mounted in the left-right direction (horizontal position) of the vehicle, and the output of the engine 30 is transmitted from the torque converter 32 and the automatic transmission 10 through image 3 The illustrated differential gear unit 34 and a pair of axle shafts 38 transmit to a pair of drive wheels 40 . The engine 30 is a driving force source and is composed of an internal combustion engine such as a gasoline engine or a diesel engine. Furthermore, the torque converter 32 is a fluid transmission device that has a lock-up clutch 28 that connects a pump impeller blade 32p and a turbine blade 32t integrally or in a predetermined relat...
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When a vehicle stops in a driving range such as a D-range at low oil temperature such as the initial stage of starting the engine, air-mixed operating oil may be supplied from the second oil passage into the torque converter. In this case, at the release of the lockup clutch in which the second line oil pressure is supplied from the second oil passage to the lockup clutch, the third oil passage is shut off (blocked) to inhibit the discharge of the operating oil. Therefore, regardless of larger pipe passage resistance due to higher viscosity, the operating oil in the torque converter is certainly discharged from the first oil passage through the cooler oil passage to the oil cooler and bubbles in the torque converter is reduced in association of the discharge of the operating oil.
Description
technical field [0001] The present invention relates to an oil pressure control device for a lock-up clutch, in particular to a technique for improving the driving performance of a vehicle which is damaged by air mixing to reduce the transmission torque of a fluid transmission device at low oil temperature. Background technique [0002] One type of hydraulic control device for a lock-up clutch includes a device including a lock-up clutch, a first oil passage, a second oil passage, and a third oil passage. Among them, the lock-up clutch is provided in a fluid transmission device such as a torque converter or a fluid coupling, and is engaged and disengaged by hydraulic pressure. The first oil passage communicates with an engagement-side oil chamber of the lock-up clutch, and supplies engagement oil pressure to the engagement-side oil chamber when the lock-up clutch is engaged. The second oil passage communicates with a disengagement-side oil chamber of the lock-up clutch, and...
Claims
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IPC IPC(8): B23P11/02
CPCF16H61/143F16H61/0206F16H59/72
Inventor石和田健中村和明
OwnerTOYOTA JIDOSHA KK