Patent ID: 11885081
Assignee: CATERPILLAR PAVING PRODUCTS INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC E  B  F | IPC E  F

Claim 15:
16. A rotor transmission hydraulic circuit operatively associated with a rotor drive transmission operatively disposed between an internal combustion engine and a cutting rotor, the rotor transmission hydraulic circuit comprising:
a hydraulic gearshift actuator operatively associated with a plurality of gears in the rotor drive transmission to selectively engage the plurality of gears in one or more gear ratios;
a gearshift directional control valve to selectively establish fluid communication between the hydraulic gearshift actuator and one of a hydraulic pump and a fluid reservoir; and
a gearshift trapping valve disposed in fluid communication between the hydraulic gearshift actuator and the gearshift directional control valve, the gearshift trapping valve positionable to establish fluid communication between the hydraulic gearshift actuator and the gearshift directional control valve when energized and to maintain hydraulic pressure in the hydraulic gearshift actuator when de-energized upon occurrence of a fault condition,
a pressure sensor operatively associated with the rotor transmission hydraulic circuit to sense hydraulic pressure therein; and
an electronic controller in electronic communication with the rotor transmission hydraulic circuit and the pressure sensor, and the fault condition is a pressure loss event with the rotor transmission hydraulic circuit as sensed by the pressure sensor.