초록 ▼

A caster wheel supporting arrangement including anti-shimmy means which is particularly useful for vehicles in which the caster wheels may be orientated at different angles to the parts supported thereby during normal forward movement of the vehicle. Such a situation occurs in large airport runway s

A caster wheel supporting arrangement including anti-shimmy means which is particularly useful for vehicles in which the caster wheels may be orientated at different angles to the parts supported thereby during normal forward movement of the vehicle. Such a situation occurs in large airport runway sweepers where the broom frame, which is supported by caster wheels, may be set at varying orientations to the normal sweeper direction. The support arrangement includes a rotary hydraulic pump, preferably of the gerotor type, the rotor of which is connected to rotate with the caster wheel bracket, and a hydraulic circuit connects the ports of the pump, this circuit including a pressure sensitive flow resisting device which opens to increase the flow area therethrough with increasing pressure difference between the pump ports.

대표청구항 ▼

A caster wheel supporting arrangement comprising: a chassis member carrying bearing means having a generally vertical axis, a rotatable assembly including a caster wheel bracket held by said bearing means, a rotary hydraulic pump carried by the chassis member and having a rotor connected for rotatio

A caster wheel supporting arrangement comprising: a chassis member carrying bearing means having a generally vertical axis, a rotatable assembly including a caster wheel bracket held by said bearing means, a rotary hydraulic pump carried by the chassis member and having a rotor connected for rotation by the rotatable assembly, said pump having two ports and being such that at any position of the rotor the pump can move hydraulic fluid from one port to the other or vice versa depending on the direction of rotation of the rotor, and a hydraulic circuit connecting the ports of the pump and including a pressure sensitive flow resisting device of the type which opens to increase the flow area therethrough dependent on the pressure difference between said ports.