Land vehicles – Wheeled – Articulated vehicle
Patent
1991-03-12
1994-07-12
Focarino, Margaret A.
Land vehicles
Wheeled
Articulated vehicle
2804051, 280407, B62D 6300
Patent
active
053281977
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a transmission and articulation arrangement between a terrain vechicle and a trailer.
Terrain vehicles known today, for example of the type shown by Finnish Patent Application No. 854777, have an articulation of rotation between a tractive vehicle and a trailer. This articulation provides for rotating movement of the two sections relative to each other in a vertical plane perpendicular to the driving direction during the operation in the terrain. The articulation of rotation is further equipped with an actuator, such as a hydraulic cylinder, which is attached at its ends respectively to the opposite sides of the articulation of rotation and which can be immobilized at a desired length thereof in order to make the articulation of rotation immobile.
The devices of the type explained above have often the need of adjustment of weight to various points longitudinally of the vehicle combination. For providing such an operation, an actuator is mounted between the body of the trailer and a body section pivotable on the body in a vertical plane extending longitudinally of the vehicle. The actuator provides for pivoting of said load section and accomplishes so the desired weight distribution in the longitudinal direction of the vehicle combination.
A drawback in the above-mentioned arrangements is in that each of the actuators accomplishes only one single operation, which has the need of their separate control as a result. Moreover, the construction is not as steady as one might desire.
The object of the invention is to disclose an arrangement, which makes it possible to eliminate the above-mentioned drawbacks. The invention is based on the idea of providing two actuators between the terrain vehicle and the trailer, the actuators co-operating both in immobilizing the angle of rotation and in shifting the weight, without each of them being designed for a single function only. In the practice, the ends of the actuators facing the terrain vehicle are attached to a rotary part of the articulation of rotation, the part being the one which in the articulation is on the terrain vehicle side, and the other ends are attached to the above-mentioned load section pivotable relative to the body section of the trailer. The provision above makes it possible to control the actuators with their common control means and further improves the steadiness of the construction.
The appended unindependent claims show some advantageous alternatives of realization of the arrangement in accordance with the invention, which help to optimize the benefits of the invention.
In the following, the invention- is described in more detail with reference to the accompanying drawings, wherein
FIG. 1 is a side elevation view of the terrain vehicle and the trailer incorporating the arrangement in accordance with the invention,
FIG. 2 is a more detailed representation of the arrangement in side elevational view, and
FIG. 3 is a schematic representation of the arrangement as seen from the tractive vehicle and it includes also a control diagram illustrating the operation of the arrangement.
FIG. 1 shows a combination of a terrain vehicle and a trailer, in which the invention is applicable. The terrain vehicle, which is the tractive vehicle, is in this case a forest tractor A comprising a front axle 11 carrying tracked wheels. A trailer B is joined to the tractive vehicle A through an articulation of turning 3 and an articulation of rotation 4. The trailer B comprises the middle axle 12 of the vehicle combination, and it also carries pairs of tracked wheels. The terrain vehicle and trailer form in this case a so-called body-steered vehicle combination, in which the steering takes place by acting on the articulation of turning 3 of the vehicle A. A rear body C is joined to the trailer B through a hitch 14. The rear body has a rear axle 13 also carrying pairs of tracked wheels. The purpose of the hitch 14 is to ensure the guiding of the rear body C so that it follows the same tracks, and the actual tractive connection is provided
REFERENCES:
patent: 2642293 (1953-06-01), Simmons
patent: 3225851 (1960-05-01), Simmons et al.
patent: 3473619 (1969-10-01), Dion
patent: 3484843 (1969-12-01), Martin
patent: 3670822 (1972-06-01), Reinhardt
patent: 3973639 (1976-08-01), Stewart
patent: 4353572 (1982-10-01), McCain
patent: 4552238 (1985-11-01), Joyce, Jr.
Karilainen Lasse
Karilainen Markku
Boehler Anne Marie
Focarino Margaret A.
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