Motor vehicles – Special driving device – Portable track
Patent
1994-11-30
1996-04-02
Hurley, Kevin T.
Motor vehicles
Special driving device
Portable track
180 67, B62D 55112, B62D 1110
Patent
active
055032389
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a spring mounted tracked tractor chassis.
2. Description of the Related Art
Spring mounted tracked tractor chassis are known, in which the traversing wheels are mounted on the frame. In the known structures, the frame appears to be an indispensable element even in those cases, when for constituting a tracked tractor a self-supporting body of a wheel tractor is used.
The disadvantage of such designs consists in that the frame substantially increases the mass of the tractor and limits the accessibility of the body. Moreover, the tractor is deflected backwards by the heaviness of the trailer tools on a three-point suspension, or by soil resistance.
Furthermore, tracked tractor chassis are known, in which the driving wheels are mounted within the region of the cone gearing and the differential planet reducers. The disadvantage of those designs consists in that the three-point suspension is situated at a considerable distance behind the axis of the rear wheels. Thus, the tilting moment, by which the tractor is effected by the trailer tools in longitudinal direction, is increased. A high tilting moment causes an unfavourable distribution of pressure under the tractor tracks, and reduces the lifting force of the machine.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the present invention is to design a spring mounted tracked tractor chassis, which can be fit directly on the tractor body, and which substantially reduces the disadvantages of the known types of designs discussed above.
In the tracked tractor chassis according to one aspect of the present invention, a double-armed balance beam is mounted rotatably by its lower arm on a main arm. The balance beam carries the journal of a tensioning wheel, and its upper arm is rotatably connected with a tension jack arranged on the main arm. The running wheels of the chassis are secured on the main arm by means of rockers with primary springs inserted therebetween. On the main arm, a secondary spring is supported from above, and is secured to a console mounted on the tractor body. The axis of the drive wheel is positioned below and behind the axis of a countershaft of a portal gear, as well as the axis of a countershaft with respect to the axis of a ring gear of the bevel gear.
In an advantageous embodiment of the chassis, both the primary and the secondary spring are made in the form of air bellows, of which the filling is controlled by position controllers. The tie rods of the position controllers are provided with length positioning devices, which are connected to the spring loading controller mounted in the tractor cab.
The primary spring of the second to last running wheel is advantageously connected with the primary spring of the last running wheel through a reducing valve, of which the operating member is connected to a grading piston. The grading piston closes a chamber on one side, which is connected to the primary spring of the last running wheel, and closes a double chamber on the other side of the piston, of which the first part is connected with the primary spring of the second to last running wheel while the second part is connected to the tension jack cylinder.
The first running wheel is connected with the second running wheel by means of a connecting rocker, mounted on the main arm by a rocker with a primary spring. The primary spring is inserted between the rocker and the main arm.
Between the rocker of the last running wheel and the main arm, a compensating hydraulic motor is inserted, which is connected with the cylinder of the tension jack by a piping with an inserted flow damper. The primary springs of both the first and the second running wheels are interconnected by a piping with a secondary spring.
The rocker of the last running wheel is connected with the main arm by means of a primary damper, and the main arm is connected, by means of a secondary damper, with a bracket on the body of the tractor.
In an advantageous embodiment of the chassis, the ring gear
REFERENCES:
patent: 3511327 (1970-05-01), Schlor
patent: 3938605 (1976-02-01), Koch
patent: 4519654 (1985-05-01), Satzler et al.
patent: 4582367 (1986-04-01), Jacquet et al.
patent: 4784232 (1988-11-01), Leboime
patent: 4960404 (1990-10-01), Reppert et al.
patent: 5286044 (1994-02-01), Satzler et al.
patent: 5409075 (1995-04-01), Nieman
Urbanek Henrich
Vrabec Jan
Ferram, spol. s.r.o.
Hurley Kevin T.
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