FI62979C - TRYCKMEDIEPAOVERKAD KIPPANORDNING FOER FLAKKONSTRUKTIONEN I ET LASTFORDON - Google Patents

Description

1 62979

The present invention relates to a pressure medium-operated tipper for a truck platform structure, which tipper comprises a telescopic cylinder and a lower support bearing between the cylinder and the vehicle body and at least between the cylinder of the vehicle body and the upper support cylinder 10, the second bearing allows bending movement between the cylinder and the frame and / or platform structure in a vertical plane transverse to the vehicle. In this context, a pallet structure refers not only to a conventional fixed open platform of a vehicle but also to various open and closed load compartments and tipping platforms, loose pallets, tanks and the like.

In order to tilt the load compartment of a truck for emptying, the so-called tipper, which is usually hydraulically operated. The tipper is mounted below or at the front edge of the load compartment with a lower bearing connecting the lower end of the cylinder to the vehicle body and an upper bearing connecting the upper end of the cylinder to the platform structure.

In order to increase the tipping stability, both bearings are formed rigid, i.e. such that the cylinder cannot turn in its bearings in the transverse vertical plane of the vehicle with respect to the vehicle body and the platform structure, respectively. However, such a rigid attachment results in considerable bending stresses on the cylinder when the body and the la structure are deformed relative to each other when the platform is unevenly loaded or driven on an uneven surface.

In order to avoid stresses on the cylinder, it is previously known to provide the bearing above the tip with a friction connection comprising a conical ring attached to the cylinder and an outer conical sleeve supported by it, which is mounted on the bearing lugs of the upper bearing. The arrangement is such that the friction joint normally remains stationary due to the friction between the conical ring and the conical sleeve but allows limited sliding movement between the conical ring and the conical sleeve under a certain torque. This avoids the bending stresses otherwise applied to the 5 tippers.

However, the described known friction joint has several drawbacks. The space requirement is relatively large because the conical ring and the conical sleeve require their own space in the transverse direction of the cylinder. Due to the transverse space requirement, the bearing points of the lead-10 support become located far apart, which causes the friction joint to slide and release the cylinder from bending stresses only when the torque becomes relatively high. The separate massive parts required by the friction joint make the structure heavy. In addition, the preparation is difficult because the sliding surfaces of the conical ring and the conical sleeve must be space-rotating surfaces. The most serious drawback is the inaccuracy of the friction joint, because depending on the lubrication conditions, the coefficient of friction can increase up to five times the value originally calculated, so that the sliding joint does not occur with the torque stress calculated in the friction joint.

The object of the present invention is to provide a tipper which eliminates the above-mentioned drawbacks and which makes it possible to reliably release the tipper from bending stresses, while using the rigid bearing of the tipper on the vehicle body and platform structure. This object is achieved by a plunger according to the invention, characterized in that at least one bearing is provided with a vertical clearance in said vertical plane.

The invention is based on the idea that the spark bearing has, at a relatively short distance from each other, in the transverse direction of the cylinder, play points which allow the platform structure and / or the vehicle body to bend freely with respect to the cylinder when the platform or body is subjected to it. the torque determined by the distance and the load 35 or greater.

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The clearances required by the invention are implemented in the bearing itself, and no additional rings or other additional elements are required for this purpose, so that the space requirement and weight are considerably reduced compared to the known structure described above. Due to the smaller transverse space requirement, the bearing points of the bearing and thus also the said clearance points can be placed closer to each other. The formation of clearances in the bearing can be achieved by conventional machining methods. Since the bending moment on the cylinder depends only on the load on the platform structure and the distance between the bearing points, the cylinder group is released from the bending stress, i.e. the rigid bearing between the cylinder group and the blade or body is triggered

The invention will be explained in more detail below with reference to the accompanying drawings, in which Figure 1 shows a side view of a truck with a tipper, Figure 2 shows a larger front view of a preferred embodiment of a tipper according to the invention with an unevenly loaded platform, Figures 3 and 4 show the top seen from the front and from the side, respectively, and Fig. 5 shows an alternative embodiment of the top bearing of the tipper.

Figures 1 and 2 of the drawings show a truck 1 provided with a tipper 2. The tipper comprises a pressure-driven telescopic cylinder 3, which is mounted on the vehicle body 5 by a lower bearing 4 and on a vehicle platform 7 by an upper bearing 6. is tiltable on a transverse pivot axis 8 supported by the frame, and a tipper is mounted on the front of the platform for this purpose.

The tip lower bearing 4 includes horizontal axle pins 33 9 located in the transverse vertical plane of the vehicle and 4 62979 rigidly attached to the lower cylinder of the telescopic cylinder. The axle pins are backlash-free mounted on bearing lugs 10 rigidly attached to the vehicle body.

5 The upper bearing 6 of the tipper comprises horizontal shaft lengths 11 located in the transverse vertical plane of the vehicle and rigidly attached to the cylinder protection tube 12. The shaft pins are mounted on bearing lugs 13 rigidly attached to the front wall of the platform. By means of the tipper 10, the pallet can be lifted between the raised inclined emptying position shown in Fig. 1 and the lowered horizontal transport position in a manner known per se.

As shown in Figures 3 and 4, the holes 14 in the upper bearing bearing lugs 14 for the shaft pins 11 are made oval in the vertical direction 15, so that the shaft pins are located in the respective holes 14 with a vertical clearance A.

When the platform is lowered, the shaft pins 11 of the upper bearing 20 press against the lower sides of the holes 14 of the bearing lugs, as can be seen in particular from Fig. 4. In this case, the body of the vehicle and the platform can be distorted relative to each other without bending stresses on the tipper, because the bearing lugs 13 of the platform can move relative to the axle pins 11 by a clearance 25 in both directions in the transverse plane of the vehicle.

When the platform is lifted with a spike, the shaft bearings of the upper bearing press against the upper sides of the holes 14 of the bearing lugs so that the lifting force of the cylinder is transferred to the platform. Torque may be generated on the platform due to uneven loading or lateral loading caused by the uneven base 30. It is noted that the raised platform can always be bent with respect to the cylinder by a certain amount of torque, the maximum of which depends only on the load of the platform and the distance between the bearing lugs but not on the friction. Figure 2 shows a ta-35 case in which the platform is distorted with respect to the vehicle body and cylinder.

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Fig. 5 shows an alternative embodiment of the tipping bearing, in which the shaft pin 11 is mounted in a backlash-free manner on a slide 15, which in turn is mounted vertically slidably in the rectangular slot 5 16 of the bearing lug 13.

The drawings and the related explanation are only intended to illustrate the idea of the invention. The tipping according to the invention can vary considerably in detail within the scope of the claims. Instead of or in addition to the upper bearing 10 of the skip, the lower bearing of the skip can be made backlash-structured as described. The clearance in the spark bearings required by the invention can also be realized by means of cylinders, these cylinders holding the shaft journals without play in the holes of the bearing lugs, but allowing the shaft pins 15 to move vertically in said holes when torque applied to the platform causes It is possible to implement the upper and / or lower bearing of the tip as a mirror image, in which case the shaft pins are attached to the platform and correspondingly to the frame and the bearing lugs are attached to the cylinder.

Claims (3)

6 62979 A pressure medium-operated tipper for a truck platform structure, the tipper (2) comprising a telescopic cylinder (3) and a lower support bearing (4) between the cylinder and the vehicle body (5) and an upper support bearing (6) cylinder and a vehicle platform structure (6). 7), wherein at least one bearing allows bending movement between the cylinder and the body and / or the platform structure in a vertical plane transverse to the vehicle 10, characterized in that the at least one bearing (6) is provided with a vertical clearance (A) in said vertical plane. Tipper according to claim 1, wherein the bearing (6) comprises horizontal bearing pins (11) and bearing lugs (13), characterized in that the bearing holes (14) of the bearing lugs (13) are vertically oval so that the bearing pins (11) can move against their axes in a perpendicular direction. Tipper according to Claim 2, characterized in that the bearing holes (14) are formed in slides (15) which are mounted vertically slidably in the slots (16) in the bearing lugs (13).