192 clutches and power-stop control – Elements – Thrust members – retarders – and stops
Patent
1987-09-14
1989-06-20
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Thrust members, retarders, and stops
180233, F16D 2514, B60K 1734
Patent
active
048402630
ABSTRACT:
A hydraulically actuated clutch is included in a four wheel drive device included in a vehicle power train, and is utilized for torque distribution between the front vehicle wheels and the rear vehicle wheels. A hydraulic control device for this torque distribution clutch includes a device for producing a control hydraulic fluid pressure for this clutch according to an oscillatory method such as a duty factor method or a dither method, an output conduit for conducting this control hydraulic fluid pressure out from this device for producing it, and a device for smoothing hydraulic pressure fluctuations in this output conduit. Accordingly, when wobbling or relatively small fluctuations tend to be induced in this control hydraulic fluid pressure in this output conduit, as may typically be caused by the oscillatory nature of the process for producing this control hydraulic fluid pressure, these wobbles and fluctuations are smoothed out by the smoothing device, thus making for smoother control of the control pressure for the clutch. Thereby, the engagement pressure of the clutch and hence the torque transmission capacity thereof are properly stabilized, and the torque distribution between the front wheels of the vehicle and the rear wheels of the vehicle is prevented from fluctuating, accordingly enhancing the drivability and the operational feeling of the vehicle, as well as decreasing tire wear and increasing roadability. This device for smoothing hydraulic pressure fluctuations may be a hydraulic accumulator; and the device for producing a control hydraulic fluid pressure may be an electromagnetic valve.
REFERENCES:
patent: 4161895 (1979-07-01), Ushijima et al.
patent: 4289221 (1981-09-01), Chambers et al.
patent: 4506773 (1985-03-01), Schott
patent: 4697479 (1987-10-01), Hayakawa et al.
patent: 4709792 (1987-12-01), Sakai et al.
patent: 4715467 (1987-12-01), Sakai
Itoh Hiroshi
Kato Nobuyuki
Takahashi Tokuyuki
Bonck Rodney H.
Toyota Jidosha & Kabushiki Kaisha
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