CS255325B1 - Three-point hitch for universal tractor - Google Patents

Abstract

Three-point hitch for a universal tractor, suitable especially for connecting mounted and trailed agricultural machines and implements, causing asymmetrical force effects on the universal tractor, consisting of lower links, an upper strut, provided with an upper suspension joint and an upper connecting joint, and lifting links.

Description

BACKGROUND OF THE INVENTION The present invention relates to a three-point linkage for a versatile tractor, suitable in particular for the coupling of mounted and hitched agricultural machines and implements producing asymmetric force effects on the tractor and comprising two lower linkages, an upper strut.

Previously known three-point hitches of universal tractors have lower Dahla interconnected by means of lifting rods and hoist arms, such a linkage is not satisfactory at a greater asymmetric! tearing the tractor due to the low rigidity and strength of this linkage, and also due to the transmission of forces through several joints, resulting in an unwanted displacement of the articulated links relative to each other due to the dude. In addition, the mechanism of the existing three-point linkages is not designed to transmit greater asymmetric forces, and the tractor allows them to be transmitted. The hitherto known three-point hitches for universal tractors are not spring-loaded in the direction of vertical force, which has the effect of introducing mutual impacts between the carried or hitched agricultural machine or the implement and the tractor. which are undesirable both in terms of mechanical stress and in terms of adverse effects on the transmission of the traction force of the tractor to the soil.

The above-mentioned drawbacks are eliminated by a three-point linkage to the universal tractor according to the invention, which is based on the fact that the lower links are interconnected transversely to each other by a link and that they are suspended on the lifting linkages formed by springs.

By interconnecting the lower links with the link, the lower links are ensured, the high stresses of the lifting linkages, the arms of the lift and the lift itself, as well as their connecting elements (joints), are eliminated. By providing the lifting rods with springs, the impacts between the tractor and the supported or suspended semi-agricultural machine or implement are substantially reduced, thereby reducing the strength of the whole system and also reducing the variation in the traction of the tractor's traction to the ground.

An exemplary embodiment of a three-point linkage to a universal tractor according to the invention is shown in the accompanying drawings, in which: FIG. 1 shows a three-point linkage to a universal wheeled tractor in axonometric view, and FIG. 2 lifting Halilo in sectional cut.

Couplings 12 are connected to the rear axle 11 of the universal wheeled tractor (Fig. 1), which are connected to the lower links 1 by means of the lower link joints 13 transversely connected to each other 2 so that they form a rigid frame in the form of The lower links 1 are connected by means of lower pins 8 to the lifting links 3, which are hinged by the upper pins 14 on the arms of the tractor's lifting mechanism 9. The lifting links 3 (Fig. 2) consist of a spring 4 housed in a holster 21 provided with a lower eye 23 for the lower pin 8, closed by a screw 20, wherein the spring 4 is supported on a nut 22 screwed on a guide 19, which is connected to a fork 18 in which a rock 16 is pivoted by means of a transverse pin 17, provided with an upper eye 15 for the upper pin 14. Mounted and trailed agricultural machines or implements are clamped using the lower link articulated joints 10 and the upper link articulated joints. 7 (FIG. 1) formed on the upper strut 5 attached to the tractor by the upper articulated joint 6.

Features:

in the case of uneven load on the lower link articulations 10, the force effects are transferred from one lower link 1 to the other lower link 1 via the link 2 and further through the lower articulated joints 13 and sleeves 12 to the rear axle 11 of the wheeled tractor a lifting mechanism which remains only retracted by the permitted stop. When vertically acting shocks occur between the tractor and the carried or trailed agricultural machine or implement, the lifting rods 3 displace and absorb the impact energy by the spring 4, thereby reducing their negative effects on the machine, both during work and transport operations.

Claims (2)

SUBJECT 1. Three-point linkage for a universal tractor, suitable in particular for the coupling of mounted and hitched agricultural machinery and implements producing asymmetric force effects on the universal tractor, consisting of lower links, an upper strut bearing an upper linkage and an upper coupling In accordance with a joint and lifting linkage, the lower linkages (1) are connected transversely to each other by a link (2). 2. The three-point linkage to the universal tractor of claim 1, characterized in that the lower links (1) are hinged on the lifting links (3) formed by the springs (4).