RU2726997C1 - Hitch mechanism of self-propelled universal mower - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: mechanism includes two intermediate and two lifting levers, two hydraulic cylinders of lifting and lowering adapter, one hydraulic cylinder of change of angle of attack of adapter, unit of springs, two hydraulic cylinders of tension of spring units, hinges, tension eccentric, mechanism of retention of hydraulic cylinder of angle of attack at docking and hook of hydraulic cylinder of angle of attack of adapter. Mechanism also includes hinges with detachable articulated bearings, a joint assembly of lifting levers and intermediate levers, and a hinge retainer installed between the lifting lever and the intermediate lever.EFFECT: invention provides reduction of mechanical action transmitted from adapter to springs of hitch mechanism and to elements of mower frame, as well as increase of adapter lifting height.3 cl, 2 dwg

Description

The invention relates to agricultural machinery, namely to mowing machines equipped with a hitch mechanism (hereinafter referred to as hitch), designed to hold the adapter and ensure the copying of the field relief by the adapter.

Self-propelled mowers (hereinafter referred to as the mower) are known from companies such as Massey Ferguson [l. MF WR 9800 Series. - Prospectus of Massey Ferguson. Website www.agcocorp.com], "MacDon" [2. M Series Mowers - MacDon Brochure. Site www.macdon.com], "CNH" [3. Speedrower Self-Propelled Windrowers. - Prospectus of the New Holland company. Website www.newholland.com] and others. The adapter is held in these models due to the fact that the adapter axis in the lower part is fixed on the lifting levers located on the left and right sides of the mower, and in the central part the adapter is fixed with a hook, which is located on hydraulic cylinder for changing the angle of attack.

The coping of the field relief with the adapter in longitudinal and transverse positions is carried out by means of a system of hinges and spring blocks.

The closest to the claimed invention in terms of technical essence is the linkage mechanism of the self-propelled mower developed by the company "MacDon" M1240 [M Series Mowers - Prospectus of the company "MacDon". Website www.macdon.com]. Its mechanism consists of two intermediate levers, two lifting levers, two hydraulic cylinders for lifting and lowering the adapter, one hydraulic cylinder for changing the angle of attack of the adapter, spring blocks, two hydraulic cylinders for tensioning spring blocks, hinges, tension eccentric, a mechanism for holding the angle of attack hydraulic cylinder during docking and a hydraulic cylinder hook changes in the angle of attack.

The disadvantages of this design are as follows:

- insufficient lifting height of the adapter above the ground in the transport position and when loading onto a cart;

- the hinges have insufficient degrees of freedom, due to which all efforts arising from the copying of the field relief by the adapter are transferred unevenly from the levers to the springs of the hitch mechanism and the frame elements of the self-propelled mower.

The objective of the invention is to reduce the mechanical impact transmitted from the adapter to the springs of the linkage mechanism and to the elements of the mower frame when copying the field relief with the adapter, as well as to increase the adapter's lifting height above the ground.

The technical result is achieved due to the fact that the design of the mower linkage mechanism, which includes two intermediate levers, two lifting levers, two hydraulic cylinders for raising / lowering the adapter, one hydraulic cylinder for changing the angle of attack of the adapter, a spring block, two hydraulic cylinders for tensioning spring blocks, hinges, tension eccentric, mechanism for holding the hydraulic cylinder of the angle of attack during docking and the hook of the hydraulic cylinder for changing the angle of attack, hinges with split pivot bearings, an articulation unit for lifting levers and intermediate bearing levers and a hinge retainer installed between the lifting lever and the intermediate lever are introduced. In this case, the hinges with split pivot bearings are located in the connections between the lifting levers and intermediate levers, between the intermediate levers and the frame elements of the self-propelled mower. Due to the introduction into the hinge part of the articulation unit of the lifting levers and the intermediate levers of the split pivot bearings when copying the field relief by the adapter, the forces are transferred from the levers to the springs of the hitching mechanism and the elements of the mower frame evenly. The insertion of the pivot lock between the lift arm and the intermediate arm increases the height of the adapter lift above the ground for loading the adapter on trolleys with high ground clearance.

The claimed device is illustrated by the drawings shown in FIG. 12:

fig. 1 - a mechanism of a hitch of a self-propelled universal mower, side view;

fig. 2 - front view of a self-propelled universal mower hitch mechanism.

The claimed invention includes the following structural elements (Fig. 1, 2): 1 - intermediate lever; 2 - lifting lever; 3 - adapter lifting-lowering hydraulic cylinder; 4 - hydraulic cylinder for changing the angle of attack of the adapter; 5 - block of springs; 6 - hydraulic cylinder for tensioning spring blocks; 7 - hinge; 8 - hinge with a split spherical bearing; 9 - hinge lock; 10 - eccentric tension; 11 - mechanism for holding the angle of attack hydraulic cylinder; 12 - the hook of the hydraulic cylinder 4 changes the angle of attack, while the intermediate lever 1 through the hinges with split pivot bearings 8 and the hydraulic cylinder for lifting and lowering the adapter 3 fixes the lifting levers 2, the hook of the hydraulic cylinder 4 changes the angle of attack 12 and the mechanism for holding the hydraulic cylinder of the angle of attack 11 is fixed on the hydraulic cylinder lifting and lowering the adapter 3, the spring block 5 through the hinges 7 is fixed on the lifting lever 2 and the tension eccentric 10, in turn the tension eccentric 10 through the hinges 7 is fixed on the frame of the universal self-propelled mower and due to the hydraulic cylinder for changing the angle of attack of the adapter 4 it changes its position for ensuring tension of the spring block 5.

The device works as follows. The adapter is fixed on the lifting arms 2 and on the hook 12 of the hydraulic cylinder 4 for changing the angle of attack. The rods of the hydraulic cylinders 6 for tensioning the spring blocks are retracted / extended to move the tension eccentric 10. By moving the tension eccentric 10 on the hinges 7, the spring tension of the spring blocks 5 changes. The spring block 5 is fixed on the hinges 7. The spring tension of the spring blocks 5 is adjusted so that balance the adapter. In the process of operation, due to the hinges with split pivot bearings 8, which are in the connections between the intermediate levers 1 and the lifting levers 2, and the spring block 5, transverse and longitudinal copying of the field relief occurs due to stretching and tension of the spring blocks 5 under the adapter's own weight. The adapter tilt is changed by extending / retracting the hydraulic cylinder rod, changing the angle of attack 4 of the adapter. The change in the cutting height of the adapter is carried out by extending / retracting the rods of the lifting-lowering hydraulic cylinders 3 of the adapter. When the adapter is lifted to move in the transport position or the adapter is loaded onto a trolley, the hinges with split pivot bearings 8 installed between the intermediate levers 1 and the lifting levers 2 are fixed by the hinge lock 9, and after that one of the rods of the hydraulic cylinders for lifting / lowering the adapter 3 is extended to the maximum length.

The technical result consists in the fact that, introduced into the hinge part of the articulation mechanism of the lifting levers and intermediate levers, a split articulated bearing provides, when copying the field relief by the adapter, the transfer of force from the levers to the springs of the hitch and the mower frame elements evenly; the introduced hinge lock between the lifting arm and the intermediate arm increases the height of the adapter lifting above the ground for loading the adapter onto the trolley with increased ground clearance compared to the prototype.

Claims (3)

1. Mounting mechanism of a self-propelled universal mower, including two intermediate levers, two lifting levers, two hydraulic cylinders for raising and lowering the adapter, one hydraulic cylinder for changing the angle of attack of the adapter, a spring block, two hydraulic cylinders for tensioning spring blocks, hinges, a tension eccentric, a mechanism for holding the angle of attack hydraulic cylinder when docking, the hook of the hydraulic cylinder changes the angle of attack of the adapter, characterized in that hinges with split pivot bearings, an articulation unit of the lifting levers and intermediate levers, and a hinge lock installed between the lifting lever and the intermediate lever are introduced. 2. The linkage mechanism according to claim 1, characterized in that the hinges with split pivot bearings are located in the connections between the intermediate levers, lifting levers and the spring block. 3. The linkage mechanism according to claim 1, characterized in that a pivot bearing is introduced into the hinge part of the articulation unit of the lifting levers and intermediate levers.

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