192 clutches and power-stop control – Clutch and brake – Vehicle type
Patent
1976-02-23
1977-06-14
Wyche, Benjamin W.
192 clutches and power-stop control
Clutch and brake
Vehicle type
188106F, 13762527, F16D 6704
Patent
active
040291839
ABSTRACT:
A control valve for a hydraulically actuated steering clutch and steering brake are provided. The valve comprises a valve housing having a plurality of bores therein, right and left hand operating rods and first, second and third spools slidably disposed within said respective bores. The spools are normally urged towards a neutral position where the hydraulic fluid from a hydraulic pressure supply source is discharged, through a drain circuit. The first and third spools are arranged such that when either of the right and left hand operating rods is moved on a predetermined stroke, the hydraulic fluid delivered by the supply source is supplied into either the pressure chamber of a right hand steering clutch or that of a left hand steering clutch, and when the operating rod is moved on a further predetermined stroke, the hydraulic fluid is supplied into either the pressure chamber of a right hand steering brake or that of a left hand steering brake, whereby the steering clutch and the steering brake can be controlled by a common control valve.
REFERENCES:
patent: 2941639 (1960-06-01), Christenson et al.
patent: 3080026 (1963-03-01), Koch
patent: 3374846 (1968-03-01), Massone
patent: 3595352 (1971-07-01), Todeschini
patent: 3841450 (1974-10-01), Drone et al.
Kabushiki Kaisha Komatsu Seisakusho
Wyche Benjamin W.
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