192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1982-12-09
1985-07-23
Krizmanich, George H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
B60K 4124
Patent
active
045304270
ABSTRACT:
A parking brake declutching system which places an earth-working machine transmission in neutral when the parking brake is engaged and prevents the transmission from being re-engaged until the parking brake is released. The parking brake declutching system includes a parking brake valve, a declutch valve, and a pair of service brake valves with the parking brake valve being connected to a spring applied, air released parking brake actuator. The declutch valve is also connected to the parking brake actuator and to a clutch cut-out actuator which selectively disengages the transmission. When the parking brake valve is positioned to actuate the parking brake, the declutch valve is positioned to direct compressed air to actuate the clutch cut-out actuator which disengages the transmission for the machine. If the parking brake valve is opened, compressed air is directed to the parking brake actuator for disengaging the parking brake. Simultaneously, air is directed to the declutch valve to position the declutch valve for releasing the clutch cut-out actuator by permitting the exhaust of air from the cut-out actuator. The transmission may then be re-engaged since the parking brake is released. The present system also provides a means for temporarily disengaging the transmission while the service brakes are applied which is desirable in some loading conditions for the machine to make maximum engine power available.
REFERENCES:
patent: 3565220 (1971-02-01), Lammers et al.
patent: 3589484 (1971-06-01), Lammers et al.
patent: 3978946 (1976-09-01), Ream
patent: 4355698 (1982-10-01), Barnes et al.
J. I. Case Company
Krizmanich George H.
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