Motor vehicles – Steering gear – No mechanical connection between steering shaft and steering...
Reexamination Certificate
2006-07-04
2006-07-04
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
No mechanical connection between steering shaft and steering...
C180S442000, C180S438000, C180S439000
Reexamination Certificate
active
07070019
ABSTRACT:
An all terrain vehicle has a frame carried by a group of wheels. At least one of the wheels is steerably connected to the frame. A steering handle assembly is rotatably connected to the frame. A servo valve has an input shaft connected to the steering handle assembly and an output shaft connected to a pitman arm. A linkage extends from the pitman arm to the steerable wheel or wheels. A pump draws fluid from a reservoir and passes the fluid through the servo valve before the fluid is returned to the reservoir. The servo valve redirects at least a portion of the flow to a cylinder to drive a ram within the cylinder in response to steering movement of the steering handle assembly. The ram, in turn, provides a power assist to the steerable wheel or wheels. A variable speed, constant displacement pump can be used to vary the flow rate in a manner that reduces the flow rate as the vehicle speed increases. Alternatively, a bypass can be used to vary a flow rate through the servo valve. A damping valve arrangement also can be provided to absorb shocks to the steering system such that the wheels can initially deflect and then return to the original position without substantial input from the steering handle assembly.
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The Motor Vehicle; Twelfth Edition; @1996; Chapter 34, pp. 872-895.
The Motor Vehicle; Twelfth Edition; ®1996; Chapter 34, pp 872-895.
Anderfaas Eric N.
Auld Jack R.
Banks Dean W.
Dunne, Jr. John C.
Dupre, III Harry Adam
Lum L.
Morris Lesley D.
Yamaha Motor Corporation USA
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