192 clutches and power-stop control – Vortex-flow drive and clutch – With means to effect torque reversal
Patent
1984-12-10
1986-04-22
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With means to effect torque reversal
91 29, 91 31, 91518, 192 325, 192 333, 192 8713, 192109F, F16D 2511, F15B 1306
Patent
active
045836248
ABSTRACT:
Fluid systems having modulating pressure relief valves are normally needed in systems having clutches that require smooth engagement. It is also desired in many systems to maintain a difference in pressure levels between the fluid in different clutches, such as, speed and directional clutches during initial engagement in order to ensure that only one of the clutches absorbs the initial load. In order to reduce power losses and improve system efficiency, it is desirable to reduce the pressure level of the higher clutch once the clutches are fully engaged. The present modulating pressure relief valve assembly provides a valve device that is effective to limit the maximum pressure in the system and change the pressure difference between the clutches upon full engagement thereof. The valve device is located in a single bore thus reducing total valve size and manufacturing costs.
REFERENCES:
patent: 3025717 (1962-03-01), Christenson
patent: 3389770 (1968-06-01), Golan et al.
patent: 3468194 (1969-09-01), Horsch et al.
patent: 3566716 (1971-03-01), Chatterjea
patent: 3739807 (1973-06-01), Landrus et al.
patent: 3998111 (1976-12-01), Blake
patent: 4046160 (1977-09-01), Horsch
patent: 4132302 (1979-01-01), Chatterjea
patent: 4138004 (1979-02-01), Horsch
patent: 4294278 (1981-10-01), Blake
Bonck Rodney H.
Burrows J. W.
Caterpillar Tractor Co.
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