SE509528C2 - Chassis for mounting driver's cabin of e.g. timber harvesting vehicle used on sloping terrain - Google Patents

Abstract

The cabin (1) can be tilted on the chassis (2) relative to both the length and width direction of the vehicle. The chassis includes a first set of parallel runners (4, 4`), each of which is engaged with an upwards-curved concave runner (6) extending in a first direction, and also with a slide (7). These slides, which can be moved relative to each other, are connected via a sledge (9) to a second set of runners (5, 5`), which are engaged with upwards-curved concave runners (6`) extending in a second direction, and also with a slide (7`). The second slides can also be moved relative to each other. The cabin is supported on and moved along the first set of runners with the aid of a first motor (11), which in turn is supported on and moved along the second set of runners with the aid of a second motor (14).

Description

15 20 25 30 35 sne szs 2 in relation to the vehicle is set automatically by the action of gravity and the oscillation movements are damped by means of shock absorbers. A disadvantage of this type of cab suspension is that the cab pivots around a pivot center which is located above the cab. This means that while the driver will be kept in an upright normal position, he will be exposed to large commuting movements and it is therefore not uncommon for drivers to suffer from "seasickness".

In the cab's maximally deflected position, it will also be deflected relatively far from its neutral position and there is therefore a risk that the cab will encounter an obstacle next to the vehicle when this is driven.

DE 3 000 606 is previously known as a tractor cab resiliently pivotable in the direction of travel of the tractor. From which are around two resiliently suspended axle pins which define a pivot axis in the transverse direction of the tractor. In one embodiment, the axle pins are individually adjustable in height by means of two double-acting hydraulic cylinders and the tractor cab can thus be tilted across the direction of travel. The turning center for the cab's inclination is located in the area where the driver is driving. This is advantageous for the reason that the driver will not be exposed to large pendulum movements, which counteracts the tendency to "seasickness".

However, with this device it is not possible to actively tilt the cab in the longitudinal direction of the machine. Furthermore, this suspension construction includes a large number of joints and pivot shafts which over time risk being worn out with play and noise as a result.

DE 3 405 921 discloses a control position, including a driver 's seat and a console with control controls, for tractors and work vehicles, which has a number of adjustment options to give the driver as comfortable a working position as possible. Among other things, the control position is tiltable in the transverse direction of the vehicle, by turning around a longitudinal axis in the area below the control position, and tiltable in the longitudinal direction of the vehicle in that two downwardly convexly arcuate gear rails are each supported on 10 15 20 25 30 35 509 528% two gears in such a way that when the gear rails are displaced forwards by rotation of the gears, the operating position will tilt backwards and vice versa. The center of rotation for tilting across the direction of travel is located below the operating position, while the center of rotation for tilting in the direction of travel is located at the level of and slightly in front of the driver 's seat. The operating position is not equipped with any means for automatic adjustment of the working position while driving the vehicle, but all adjustment is intended to be done fully or semi-manually. Because only the operating position itself is tiltable, it is required that any cab in which it is mounted must have adequate dimensions in order for the operating position to be accommodated even in an inclined condition without this or the driver hitting the side walls of the cab.

Brief description of the invention The present invention aims to eliminate problems and disadvantages of prior art and to create a simple, efficient and space-saving suspension device of the kind mentioned in the introduction which allows smooth and playful adjustment of a vehicle cab at different angles of inclination relative to a vehicle in both its longitudinal direction and transverse direction. At least these objects are achieved by means of a suspension device according to claim 1.

In a preferred embodiment of the invention, it is also an object that the axes of rotation for the inclination in both the longitudinal and transverse directions should substantially intersect at a point or a center of rotation and that the center of rotation should be located within the cab, preferably within the driver's body. in a normal driving position, and most preferably within the driver's torso. These objects are achieved by means of a suspension device according to preferred embodiments specified in the subclaims.

The invention is thus based on the insight that the stated objects and advantages can be achieved by the cab being slidably carried along a first set of guide devices which in turn are slidably carried via a sled device on a second set of guide devices.

In the preferred embodiment, there are two guide devices in the longitudinal direction of the vehicle and, perpendicular to them, two guide devices in the transverse direction of the vehicle. However, the invention is not limited to this since the guide devices could also extend in other directions in relation to the vehicle, eg diagonally in relation to each other. and in other non-right angles to Each guide device in the preferred embodiment consists of an elongate guide in the form of a vertical, upwardly concave profile with a U-shaped cross-section with the flanges directed horizontally to one side. The guide cooperates with a slide in such a way that these are displaceable in relation to each other. The slide has essentially the same main shape as the guide, ie an upwardly concave profile with a U-shaped cross section that has the flanges directed horizontally to the side but in the opposite direction in the front. However, the slide is considerably shorter than the guide. The guides and slides in each holding to the cooperating guide. pairs of guide devices are turned with their respective flanges in opposite directions so as to provide lateral stability and control.

Furthermore, the first pair of guides are connected to the underside of the cab and run in their respective slides which are connected to each other via the sled device. The other pair's guides are also attached to this and run in their respective slides which are attached to the vehicle's chassis.

However, the location and design of the guides and slides could be varied in a variety of ways within the scope of the invention. For example, the positions of the guides and slides could be reversed in both the first and second pair of guide devices and the slides could be made with wheels or rollers while the guides could have, for example, a tubular shape. 10 15 20 25 30 35 5G? 528 The displacement between guides and slides in the respective pairs of guide devices, and thus the adjustment of the cab at different angles of inclination, is achieved by means of hydraulic cylinders which act between the cab and the sled device and the sled device and the chassis, respectively. However, the displacement could also be performed by some other suitable means, for example hydraulic motors.

The hydraulic cylinders can be maneuvered manually by the vehicle driver, but it is preferred that the maneuvering can also, if desired, be done automatically by sensors that detect the position of the vehicle and take care of adjusting the cab accordingly. Such automatic operating systems are known in the art and no further description of their function is therefore required.

Because the cab is slidably arranged on arcuate guides, the angle adjustment will be smooth and without jerks. In the preferred embodiment, the guides, in the neutral position of the cab, are placed with their lowest points substantially in the same plane and they also have substantially the same radius of curvature. The axes of rotation of the first and second pairs of guide devices will then intersect in a common center of rotation. By locating the center of rotation in the cab, preferably in the driver's body when placed in the normal driving position, and most preferably in the driver's torso, it is ensured that the cab is operated with as little discomfort as possible for the driver. In addition, this means that the required maneuvering space for the cab will be small.

Brief Description of the accompanying Drawings The drawings show in: Fig. 1 a partially sectioned, perspective exploded view of a vehicle cab which is, via a suspension device according to the present invention, mounted on a vehicle chassis, Fig. 2 a cross section through a guide device according to Figs. 1, 10 Fig. 3 is a front view of a vehicle cab which is shown in broken lines in two maximally deflected lateral tilting positions, and Fig. 4 is a side view of the vehicle cab which is shown in broken lines in two maximally deflected tilting positions in the forward direction. resp backwards.

Detailed description of a preferred embodiment of the invention First reference is made to Fig. 1, in which a vehicle cab, denoted by 1, schematically shown in Fig. 1, is illustrated in a perspective view which is carried on a vehicle chassis 3 via a generally designated 2 device. The suspension device comprises two guide devices 4, 4 'in the longitudinal direction of the vehicle and two guide devices 5, 5' in the transverse direction of the vehicle. Each guide device includes one and one slide 7,7 'displaceable relative to each other. The guides 6 in long guide 6, 6 'which engage in and are the first pair of guide devices 4, 4' are connected via brackets 8 to the underside of the cab 1. Corresponding slides 7 are connected via a carriage-like part or device 9. The guides 6 'to the second pair of guide devices 5, 5' are also connected to the carriage device and the corresponding slider 7 'is fixed on an upright bracket 10 on the chassis. With the above-described suspension device, the cab 1 is consequently slidably supported, via the first pair This is in guide devices 4, 4 ', on the sled device 9. in turn slidably supported, via the second pair of guide devices 5, 5 ', on the vehicle chassis. The displacement between the vehicle cab 1 and the carriage device 9 is provided by two hydraulic cylinders 11 whose piston rod ends are connected to the underside of the cab via a bracket 12 while the cylinder part is connected to the carriage device via a bracket 13. the vehicle chassis is connected to the carriage device 158 25 25 509 528 via a bracket 15 while its cylinder part is connected to the chassis via a bracket 16.

For a description of the more detailed design of the guides and slides, reference is also made to Fig. 2, which shows a cross section through a guide 6 and a slide 7. As can be seen, the guides are arcuate and have a U-profile in cross section with a vertically oriented web 17 and two laterally - l8 '. shaping with the difference that they are shorter and their flanges are directed in opposite directions in relation to the cooperating guide. The slides are furthermore so positioned that stretched flanges 18, The slides have corresponding outer flanges are located on either side of the upper flange 18 of the guide and to reduce the friction between the guide and the slide, the slide is made with a sliding bearing in the form of two plastic coatings 19, 19 'which abuts against both sides of the upper flange 18 of the guide. The sliding bearing is furthermore designed such that the upper plastic coating 19 is fixed to a plate 20 which is adjustable via adjusting screws 21 towards and from the lower plastic coating 19'. In this way, the play between the guide and the slide can be easily adjusted as desired and after successive wear of the plastic coatings.

Next, reference is made to Figs. 3 and 4, in which a front view and a side view, respectively, of a vehicle cab are shown, and with dashed lines the maximum tilt positions of the cab are marked. As can be seen from Fig. 3, the cab is inclined in the transverse direction of the vehicle with an angle α in each direction which in practice can suitably amount to about 15 °. Fig. 4 illustrates the maximum angles of inclination ß in the longitudinal direction of the vehicle and this angle can in practice suitably amount to about 15 ° forwards and about 20 ° to the rear. The center of rotation for both lateral and longitudinal tilting is located at a point 22 which will be located within the torso of a driver who is placed in a normal driving position.

Claims (10)

10 15 20 25 30 35 509 528 2 8 PATENT REQUIREMENTS for a work vehicle of the type adapted to perform 1. l. Suspension device for a vehicle cab (l) work in sloping terrain, wherein the suspension device (2) has the task of supporting the vehicle cab on the vehicle and enabling the cab to be tilted in relation to the vehicle in both its longitudinal direction and transversely. that the same means 4 ') each comprising an arcuate, upwardly concave, in a first direction extending guide element (6) and a (7) which are displaceable relative to (9), bonded to a second set of guide devices ( 5, direction, characterized a first set of parallel guide devices (4, slide elements stand in front 5 ') upwardly concave, each other, and which, via a slide device each comprising an arcuate shape, in a second direction at an angle to the first direction (6 ') (7') which are displaceable in relation to each other, extending guide elements and a slide element, the cab being supported on and by means of force generating means (II) 4 ') which in turn is supported by or the power (14) device set (5, slidable along the first guide device set (4, slidable along the second guide 5 '). Suspension device according to claim 1, characterized in that the pivot shaft (5, and the pivot shaft of the second 5 ') pivot devices (4) intersect each other in a common center of rotation (22). Suspension device according to claim 2, characterized in that the guide device set is located substantially in the same plane in that the guide elements (6, 6 ') in respective and have substantially the same radius of curvature. Suspension device according to claim 2 or 3, (22) is preferably within the body characterized in that the center of rotation is located within the vehicle cab, of a driver placed in a normal driving position, and most preferably within the driver's torso. Suspension device according to one of the preceding claims, wherein the suspension device comprises two guide elements (6) in the longitudinal direction of the vehicle and two guide elements (6 ') in the transverse direction of the vehicle. Suspension device according to one of the preceding claims, characterized in that the guide elements (6, 6 ') and the slide elements (7, 7') are displaceable in relative (l9, l9 '). Suspension device according to one of the preceding claims to one another via plain bearing requirements, characterized in that the guide elements (6, 6 ') have a horizontally directed flange (18) while the slide elements (7, 7') have an upper and a lower plain bearing layer ( 19, 19 ') which abut against the upper or lower side of the flange (18). Suspension device according to claim 7, characterized in that at least one plain bearing layer (19) is adjustable against and from the other. Suspension device according to one of the preceding claims, characterized in that the guide devices (4, 4 ', 5, 5') are located substantially below the vehicle cab (1). Vehicle cab, the same comprising a suspension device (2) characterized in that according to any one of the preceding claims.