FI101257B - Agricultural machine pulling device - Google Patents

Description

101257

Agricultural machinery tractor

The invention relates to a traction device for an agricultural machine, which enables the machine to be transported in a hoist-adapted manner and to work in such a way that the machine operates as a trailer and the tractor-machine combination can be used to make sharp bends during work.

Tractor-mounted agricultural machines can be divided into two 10 basic types, trailed and 3-point linkage adapters. In addition, there are some mixed forms in which the machine is, for example, to be towed in the working position and to be lifted in the transport position. Mixed shapes are used especially when the towed working position provides functional benefits such as better maneuverability. Hoist-fitted implements are equipped with a traction device, often referred to as a traction triangle, which is dimensioned according to some general standard defining the dimensioning. Trailed machines can be connected either to the tractor's drawbar, of which there are also various standards, or to the drawbar of a 3-point linkage, which is often referred to as a semi-expensive design. The advantage of the semi-trailer construction is that the height of the drawbar of the implement can be easily adjusted, as the drawbars can be raised and lowered by the tractor's hydraulics over a wide height range.

Implements which, due to their weight, are suitable for lifting the tractor's 3-point linkage, i.e. for lifting device adapters, are also often made as such, since no rubber wheels are required for transport in this construction. Trailed machines require transport wheels that must be suitable for road use. Pneumatic wheels or the like are quite expensive and therefore a hoist-fitted machine is usually cheaper to build than a towed one.

It is an object of the present invention to provide an improved traction device between a tractor and an implement which allows the implement to be moved away from the tractor to a working position which is intended to be lifted by the tractor's lifting devices during transport. To achieve this object, the mechanism according to the invention is characterized by the things set forth in the characterizing part of claim 1.

The advantages of the fastening mechanism according to the invention to the solutions according to the prior art are apparent in the following description 10 with reference to the accompanying drawings, in which:

Figures 1-3 show some prior art traction solutions, Figures 4-5 show a schematic side view and a top view, respectively, of an embodiment of the invention, and

Fig. 6 shows a view corresponding to Fig. 4 on an enlarged scale 20 and with the working machine in the working position, with parts of the working machine in Figures 1-3 being omitted for the sake of clarity.

Let us first consider traction devices on machines where it would typically be desirable to be able to make turns during work. Such machines include e.g. various tillage implements, such as cultivators, S-harrows, Sat-harrows, etc. The most traditional and undeveloped type of drive-30 is fixed so that in the direction of travel the machine center line remains parallel to the tractor center line if the tractor's 3-point linkage drawbars are mounted solid. Attempting to bend the tractor while working will result in strong bending of the drawbars and damage to the stops limiting the lateral movement of the drawbars.

3 101257 To facilitate turning, a wide variety of drive constructions have been developed for hoist-fitted machines. In practice, in addition to the traction structures, the turning is limited by the physical distance from the rear wheels of the tractor to the structures of the implement 5, especially if the tractor uses wide low-pressure tires or spreading wheels. The turning space can be increased by moving the tractor away from the machine in the working position.

However, in the transport position, the center of gravity of the hoist-fitted machine should be as close as possible to the tractor 10 so that the static counterweight generated by the tractor is sufficient and the need for additional counterweights to be mounted on the front of the tractor is kept to a minimum.

The logical conclusion from the above is that the traction device 15 should be able to be away from the implement in the working position, but close to it during transport. In more advanced traction devices, such a function has been sought.

In one prior art device, the drawbar is slid-20 in the ground slot, whereby when pulling forward from the harrow, the distance from the tractor to the harrow structures increases somewhat and thus the maneuverability is improved. However, the push rod lug is fixedly attached to the harrow frame. For this reason, especially if the slot length is large, there is a need to adjust the tractor's push arm / 25 when moving from the transport position to the working position or vice versa. There is also a risk that an inexperienced driver will not make the necessary adjustment and the harrow will be pulled by means of a push rod, which of course is not the intention.

In another prior art device shown in Figures 1 and 2, the coupling of the drawbar 1 to the harrow body 2 is provided by a chain 3 which allows the drawbar to move away from the body and turn relative to the body, which turning is limited by the arch structure 4 (Figure 2). Instead of a push arm, a chain is used, which allows the distance between the implement and the tractor to vary, • if the length of the chain is set sufficiently. When moving to transport run 4 101257, the chain length must usually be reduced so that the stern of the implement rises sufficiently when the machine is raised.

5 A prior art solution is shown in Figure 3, in which a high pivotability is sought in the harrow drive device. Also in this drive design, a greater distance has been achieved between the tractor and the implement in the working position compared to the transport position. Comparing the chain solution 10 of Figures 1-2, it can be seen in the construction of Figure 3 that a lack of degree of freedom allowing rotation along the longitudinal axis of the harrow can be observed.

In yet another prior art solution, the traction triangle is fixed to the tractor in a standardized manner.

The traction triangle can be pulled off the harrow from the frame, whereby the traction rods open accordion-like on the joints. The harrow has a fixed traction device in the frame, which in the transport position is locked in the traction triangle by means of a locking device. In the transport position 20, the large traction on the tractor's drawbar is transmitted from the traction triangle via the locking device to the fixed traction device and through the tines to the harrow frame. The advantage of the traction device is the high maneuverability in the working position. The downsides are the rather expensive structure and the durability problems of the joints.

: 25

The traction device 20 according to the invention is shown in Figures 4-6. The traction device enables good maneuverability in the working position and the proximity of the implement's 30 centers of gravity during transport.

The coupling to the tractor complies with the European standard, 30 and no adjustments are required when changing from work to transport or vice versa. The traction device 20 does not transfer unreasonable loads to the tractor's 3-point lifting devices, even if the field to be modified has a different surface formation. The drawbar 26 is secured to the drawbar 22 by a loose vertical pin 28 or balloon joint 22. In Figures 4-6, the pin 28 is attached to the drawbar 22 and a hole is formed in the drawbar 26 to which the pin fits loosely. With this structure, the drawbar 26 attached to the drawbars of the tractor 10101557 can be pivoted over a wide range about the axes Z and Y with respect to the drawbar 22 and the harrow body 29. In the working position, the tractor and the harrow also articulate relative to each other around the X-axis. This is possible because the drawbar 26 is attached to the tractor's drawbars by round pins 32 and the drawbar 21 is designed so that in the working position it does not transmit forces between the drawbar 20 and the harrow body 29. The harrow body 30 has guide members, such as a slot 33 and a sliding slot (not shown), 10 which allow the detached end of the drawbar to move in the direction of the Y-axis. The push rod lug 27 attached to the vertical tube 31 of the traction device 20 is articulated so that it can pivot about the Z axis. Thus, for steep turns, the range of motion of the ball joint of the tractor's push arm does not limit 15 turning angles. In order to bring the harrow close to the tractor in the transport position, the drawbar 22 can be retracted inside the frame 29. At the same time, the drawbar 21 moves backwards and the grapple 23 at the rear end of the rod engages the retaining pin 24 in the frame 29. The drawbar 21 can then transmit forces 20 from the tractor push rod is provided with a locking mechanism which operates automatically when the grapple 23 engages the detent pin 24. The traction device further comprises a trigger mechanism 34 for releasing the locking members 23, 24, which trigger mechanism is preferably arranged for use from the tractor cab, e.g. by a rope or wire 35.

Locking and unlocking mechanisms ensure the transport position and facilitate the transition back to the working position. Rotation of the shafts 30 X, Y and Z in the transport position is prevented by lugs 25 connected to the implement body 29, to which the drawbar 26 is locked when the drawbar 22 is retracted into the body 29.

35 The structure shown in the example is an application in a shovel roller medicine. However, the description or figures do not limit the possible applications of the construction, which are also covered by the claims.

Claims (7)

A traction device (20) between the tractor and the working machine (30), which allows movement of the working machine (30) to a working position away from the tractor, which working transport (30) is intended for lifting with the tractor's lifting device, wherein the working machine (30) is in working position allowing the pulling device (20) to allow rotation of the working machine (30) relative to the tractor around the axes X, Y and Z, whereas in the transport position the rotation about said axes is at least substantially prevented, where said Y-axis is a horizontal axis in the longitudinal direction of the working machine (30), the X axis is a relative to the substantially perpendicular horizontal axis and the Z axis is a substantially perpendicular to the X and Y axes, the pulling device (20) having a in relation to the body (30) of the working machine (30), telescopically displaceable drawbar (22), characterized in that the pulling device therewith exhibits drawbar g (21) which is connected to the body (29) of the working machine (30) with reading means 20 (23, 24), which reads the drawbar (21) pulling power to the body (29) during the transport of the working machine and which reading means (23, 24) can be released during use of the working machine (30) so that the drawbar (21) is free from traction mediating coupling to the working machine (30) using the working machine, allowing the working machine (30) to rotate about the X axis. 2. A tractor according to claim 1, characterized in that the reading means (23, 24) can be released with a manually operated rope or cable (35) from the cab. V 30 3. A tractor according to claim 1 or 2, characterized in that it has a towing rod (26) which is pivotally attached to the tractor (26) which is pivotally attached to the tractor (26), which is connected to the towing rod (22) with a connection means enabling rotation about Z - and the Y axis. 101257 4. A traction machine according to claim 3, characterized in that said connecting means has a vertical pin (28) fixed to the drawbar (22), which with clearance is connected to a heel in the drawbar (26), which allows the rotational movement about said Z and Y axes. 5. A traction machine according to claim 3, characterized in that said connection means has a ball joint between the drawbar (22) and the drawbar (26). 6. A tractor according to any one of the preceding claims, characterized in that a bracket (27) is connected to the upper part of the tractor (20) to the push-bar of the tractor's three-point lifting device pivotally around the Z-axis. 15 7. A tractor according to any one of claims 1-6, characterized in that the body (29) of the working machine has the receiving control means (33) of the drawbar end (33) which allow the movement of the drawbar (21) to be released in the direction of the Y axis. 20