192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch
Reexamination Certificate
2006-07-11
2006-07-11
Rodriguez, Saul (Department: 3681)
192 clutches and power-stop control
Vortex-flow drive and clutch
Including drive-lockup clutch
Reexamination Certificate
active
07073647
ABSTRACT:
There is provided a hydraulic pressure control apparatus for a vehicular hydraulic power transmission device with a lock-up clutch, in which an increase in the temperature of hydraulic oil in an engagement side oil chamber is suppressed, durability of frictional material is improved, and the lock-up clutch is appropriately controlled.A switching control valve (a lock-up relay valve250and a lock-up control valve252) switches between connection and disconnection between each of two oil passages that communicate with an engagement side oil chamber31,and each of a high pressure oil passage and a low pressure oil passage, according to the operating state of the lock-up clutch11.For example, when the lock-up clutch is completely engaged, the hydraulic oil is supplied to both the two oil passages from the high pressure oil passage, hydraulic pressure PON in the engagement side oil chamber31is increased, and a sufficient transmission torque capacity of the lock-up clutch11is obtained. When the lock-up clutch11is in the slip state, one of the two oil passages is connected to the high pressure oil passage, and the other oil passage is connected to the low pressure oil passage such that the hydraulic oil is circulated in the engagement side oil chamber31.Therefore, an increase in the temperature of the hydraulic oil is suppressed, the lock-up clutch11is cooled, and the durability of the frictional material36is improved.
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Morise Masaru
Sugawara Akio
Takeuchi Hiroaki
Yasuda Yuji
LandOfFree
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