| 摘要 |
<p>837,107. Adjustment of orientation of tractor driving wheels. VAN DER LELY, C. Dec. 17, 1956 [Dec. 17, 1955], No. 38448/56. Class 108(2) [Also in Group XXXIV] In a wheeled vehicle, means is provided for canting a running wheel 14 into at least two working positions, in at least one of which the wheel axis lies at an angle to the horizontal, the wheel having at its circumference at least two differently shaped surfaces or groups of surfaces, the arrangement being such that in at least one of the two positions of the wheel 14 only one of the surfaces or groups of surfaces is in contact with the ground. As applied to a tractor, each end of the rear axle 11 is cranked at 13 and is pivotally connected at its extremity 16 to a fork 17 carrying a stub axle 18 for the wheel 14. The inclination of the plane of the wheel may be varied by the action of a hydraulic piston and cylinder 24 connected between the outer end of the fork 17 and the axle 11. The cylinder 24 is connected to a hydraulic pump driven by the engine of the tractor. This pump is also connected to hydraulic motors (not shown) incorporated in the hubs of the wheels 22 for driving the wheels 22 and actuating the brakes. If it is desired to increase the track of the vehicle, bolts 51 of a clamp 50 for the axle 11 are released and the tractor is driven forwardly so as to bring a rotation of the axle 11, so that the crank extensions 13 are inclined upwardly instead of downwardly as shown in Fig. 1. The wheels are then canted outwardly from this position to obtain the greater track width (Fig. 8, not shown). Anti-skid members 27 are carried by a ring 29 which is adapted to be secured to the outer face of the wheel 14. In an alternative form (Figs. 5 and 6, not shown), the ring 30 carries a cage-like member of frusto-conical shape. Instead of the ring 30 and associated anti skid members, a tyre (see Group XXXIV), having two respective zones of differing type of tread surface, may be employed for the wheels 2. The axle 11 may be axially slidable relative to the clamp 50. The pivot 16 for the fork 17 may be located away from, instead of coincident with (as shown in Fig. 1), the plane of the wheel 22.</p> |
