BRPI0805573A2 - rear wheel drive mechanism of a cargo vehicle - Google Patents

Abstract

Consisting of a platform that can be attached to the chassis of a vehicle; where such a platform contains one non-steerable axle and two non-steerable axles, combined with one another by means of arms interconnected with a swivel cylinder, such that, when the hauling vehicle is to turn, these wheelsets are attached. to the rear platform rotate synchronously, ensuring that the curve made by the truck has a substantially smaller radius of curvature.

Description

REAR WHEEL STRUCTURE MECHANISM OF A LOAD VEHICLE

TECHNICAL FIELD

The following descriptive report of the present application relates to the development of a rear wheel steering mechanism of a cargo vehicle, consisting of a platform that can be coupled to the chassis of a vehicle; where such a platform contains a non-steerable axle and two steerable axes combined between siphon arms interlocked with a swivel cylinder such that when the cargo vehicle is to turn, these wheelsets attached to the rear platform will rotate. synchronously, ensuring that the curve made by the truck has a substantially smaller bend radius.

STATE OF ART

One of the major problems with the use of large cargo vehicles such as trucks, semi-trailers, bitrens etc. This is precisely its great length. When driving on highways that do not have to make small-radius curves, they have no greater drivability, except for the inconvenience of a vehicle of this size. However, when entering cities, they face the problem of maneuvering, entering the business yard, turning corners and turning corners. An unbarred vehicle can easily reach 18 meters in length and a bit of 30 meters, making it a drag on a city. To make a turn around a corner, a vehicle of this size has to go far ahead before starting to turn. This causes the little schooner to almost pass the street he wants to turn to bring the semi-trailer. Another major drawback is rear wheel drag. In ordinary trucks only the front wheel can be driven. The rear wheel pulls it sideways when entering a turn. This is true for any type of truck, semi-trailer and bitrem.

To solve this problem, mechanical constructions are known that make the rear wheel steering of these cargo vehicles. It is also known an apparatus supporting the chassis of a truck, and this apparatus is equipped with dual wheels with combined steering of the two axles.

Searches in the state of the art pertinent to the technical field of the invention revealed the existence of documents that reveal solutions to the problems raised.

JP 6,135,330 to TORU et al. (1994) - Truck with steering link - Describes a mechanism for vertical steering of the vehicle's trick. It works like some kind of terrain copying pantograph.

JP 60,015,716 to JITSUI et al. (1985) - Automatic traveling truck - Describes a device for facilitating the driving of a truck by automatically correcting the steering angle of the front wheels of the truck by the rear wheels.

JOSEPH EP 1,394,018 (2004) - Automatic traveling truck - Describes a chassis where the rear wheels of the truck or semi-trailer can make a shorter radius turn.

The document BR 0.401.289 of QUEIROZ (2004) describes an articulated chassis with wheel steering suitable for rough terrain, formed by two independent parts. A front frame coupled by means of a pivot axle that is oriented longitudinally of the equipment mounted under pivot bearings to a rear frame which allows relative rotation between them and four-wheel independent front and rear steering combinations; with synchronism logic performed by its own integrated system.

Also from QUEIROZ, there is an electronically assisted wheel steering synchronization vehicle steering system, revealed by BR0.406.048 (2004), where an electronic decision management mechanism, which controls the actions of steering corrections, through actuators individually mounted in each wheel. These actuators may be of various types. Among the possible behavioral patterns of wheel bearings, attention is paid to synchronization that provides stable handling, reduced effort on the suspension and steering elements, as well as better maneuverability and greater safety for the vehicle driver.

ART PROBLEMS

The rear wheel steering systems of truck, semi-trailer and bitrens vehicles show devices that allow single and dual-wheel steering to be employed using various means.

JOSEPH shows a rear platform that can be angled over an axle under the body of the semi-trailer. Technically, the effect is de-stressing even though the whole set rotates.

TORU shows a rear set that performs a vertical displacement, allowing the vehicle to easily overcome obstacles on the ground. The apparatus consists of double wheels that work independently of each other.

The JITSUO "trolley" corresponds to a support platform that performs wheel steering but employs a different means of doing so.

PROPOSED SOLUTION

Thus, due to the considerations pertaining to the state of the art described above, it is an object of the present application to create a rear wheel steering mechanism for a dump vehicle, such as a truck, semi-trailer, bitrem etc. ,

By employing a platform that attaches to the underside of a vehicle chassis, this rear wheelset actually tracks all its wheels.

The system contains two axes that are linked together by arms to a large swivel cylinder. Said axles contain the conventional wheels and tires of a cargo vehicle. These arms are cross-linked to this cylinder so that twisting this cylinder to one side causes the arms to pull the axes to the same side, steering the wheels to that side. This construction allows for a considerable reduction of the vehicle's axle and prevents the tire from dragging as the wheels are angled to the side that is turning.

The slewing cylinder assembly plus cross arms and axles with wheels are mounted on a support frame that is below the vehicle chassis. This structure can be freely rotated to a certain angle and is limited by stops that prevent excessive turning. When a cargo vehicle is going to turn, the horse may turn freely due to the fifth wheel coupling. The chassis begins to shift so that it can turn and the lower frame moves more sharply, causing the wheels to steer by the arms that are attached to the cylindrical axle. When the curve was made, the movable structure below the chassis returns to the normal position aligned with the chassis, bringing along with it the wheels that also return to the normal position, parallel and aligned with the respective axes.

Each vehicle spring beam is accommodated in specific <table> <table> cradles on each arm-moving axle.

DESCRIPTION OF THE FIGURES

The characterization of the present patent document is made by means of representative drawings of the rear derailing mechanism of a cargo vehicle, such that the device can be fully reproduced by suitable technique, allowing full characterization of the claimed object functionality.

From the elaborated figures that express the best way or preferential way of realizing the product now idealized, is based the descriptive part of the report, through a detailed and consecutive numbering, where this clarifies aspects that may be understood by the representation adopted, in order to clearly determine the protection now intended.

These figures are for illustrative purposes only and may vary as long as they do not depart from the original claim.

In this case one has to:

Figure 1 illustrates a perspective representation of the mechanical assembly responsible for wheel steering, coupled to the chassis of a cargo vehicle;

Figure 2 shows another perspective of the proposed mechanical assembly, where it is possible to see the chassis at an angle to the mechanical assembly below it;

Figure 3 shows the front orthogonal view of the mechanical assembly coupled to the chassis;

Figure 4 shows the top orthogonal view of the alignment and chassis assembly, ie the mechanical assembly is aligned with the cargo vehicle chassis;

Fig. 5 shows another top orthogonal view, where the set is angled in relation to the chassis;

Figure 6 shows the lower orthogonal view of the angled chassis with the developed mechanical assembly and;

Figure 7 shows another lower orthogonal view, where the mechanical assembly aligned with the chassis can be seen.

DESCRIPTION OF THE INVENTION

A preferred embodiment of the invention comprises an assembly comprising a torsion assembly T:

- two axles (1 and 2) comprising wheels and tires (24), containing two types of cradles (3 and 4) on which the spring bundles (25) are supported;

- four arms (5, 6, 7 and 8) which are connected to the axes (1 and 2) and also connect to the central torsion cylinder (9), which is supported by a platform (10), these arms being attached to said one. crossover cylinder: upper (5) crossed with lower (6) and upper (7) crossed as lower (8).

The torsion assembly T is coupled to a frame (11) which in turn is mounted below a chassis (12) of a cargo vehicle.

Said structure comprises:

- a frame composed of two parallel bars (13 and 14), bearing supports for the spring bundles (15 and 16) near the ends and near the center, and curved crossmembers (17 and 18);

- a central element (19), where the bars (13 and 14) join together forming a center of rotation;

- projections placed below the frame (11) and terminating thereon, having slanted bars (20 and 21) on either side;

- curved bars (22 and 23) with the same radius of curvature as the upper bars (17 and 18), serving as a bumper-type protection when the mechanical assembly is rotated;

This structure (11) can freely rotate to a certain point and is locked by limiters. By turning it moves the cylindrical axle (9) which promotes steering of the wheels connected to the axles (5, 6, 7 and 8).

This mechanical set shown contains three wheels, and the center wheel has no axle rotation, only shifting when the vehicle finishes making a curve, aligning the chassis with the mechanical set.

In the construction shown as an example, the semi-trailer chassis (12) is engaged with the wheel (not shown) by the fifth wheel and king pin (26). When the truck describes a turn on a road or to turn a corner, the chassis follows the movement of the horse, while the mechanical assembly (11) placed below the chassis (12) begins to follow the turn of the vehicle, promoting wheel steering by the arms (5,6, 7 and 8) considerably reducing the turning radius required to A large truck.

Upon resuming the straight line, the truck pulls the semi-trailer that promotes automatic alignment between the chassis (12) and the mechanical assembly (11).

It is noted that the movement of the wheel steering mechanism T moves in perfect harmony with the angular displacement of the chassis. Higher chassis displacement causes the steering mechanism to provide greater steering on wheelsets (1 and 2).

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Claims (7)

1.- REAR WHEEL STRUCTURE MECHANISM OF A LOAD VEHICLE, characterized by the fact that it consists of a platform that can be coupled to the chassis of a vehicle; where this platform contains two steerable axes, combined with one another by means of interlocking couplings to a swiveling cylinder, such that when the vehicle is about to turn, these wheelsets attached to the rear platform rotate in a synchronized manner, ensuring that the curve made by the truck has a significantly smaller radius of curvature. 2. A REAR WHEEL BEARING MECHANISM OF A LOAD VEHICLE according to claim 1 and comprising a T-torsion assembly comprising: - two axles (1 and 2) supporting the wheels and tires (24 ), containing two types of cradles (3 and 4) supporting the spring bundles (25) - four arms (5, 6, 7 and 8) which are connected to the shafts (1 and 2) and also connect to the central cylinder of torsion (9), this one is supported on a platform (10), and these arms are attached to said modocruz cylinder: upper (5) crossed with the lower (6) and the other upper (7) crossed as lower (8) . 3. A REAR WHEEL BEARING MECHANISM according to claim 1 and characterized by the fact that the twisting assembly T is coupled to a frame (11) which in turn is mounted below a chassis (12) of a cargo vehicle. 4. A REAR WHEEL BEARING MECHANISM OF A LOAD VEHICLE according to claim 3 and characterized in that the structure (11) comprises: - a frame composed of two parallel bars (13 and 14), supporting the spring beams (15 and 16) near the ends and near the center, and curved end plates (17 and 18) - a central element (19) where the bars (13 and 14) join together to form a center of rotation - projections below the structure (11) and terminals thereon, having slanted bars (20 and 21) on either side - curved bars (22 and 23) with the same radius of curvature as the upper bars (17 and 18). REAR WHEEL STRUCTURE OF A LOAD VEHICLE according to claim 4 and characterized in that this structure (11) can be freely rotated to a certain point and locked by limiters. 6 REAR WHEEL BEARING MECHANISM OF A LOAD VEHICLE according to claim 5 and characterized by the pivoting of the frame 11 as it rotates it moves the cylindrical axle (9) which promotes the steering of the wheels connected to the axles (5, 6, 7 and 8).