JPS5933205Y2 - Top link mounting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a top link attachment device for a three-point linkage mechanism in a tractor, and is capable of vertically adjusting the pivot point of the top link as necessary.

The so-called special three-point link mechanism, in which a top link holder is attached to the top link mounting base at the rear end of the tractor body, and the top link is pivotally connected to the rear end of the top link holder, is a well-known conventional mechanism. This has the advantage of allowing the working machine to rise upwards and increasing the ground clearance, so it is now widely used for attachment to various working machines.

However, the work equipment that is attached via this special three-point linkage mechanism is designed for the special three-point linkage mechanism of a specific model, and has the drawback of lacking versatility between models.

This is because even for tractors with the same class of output, if the rear tire diameter changes, the length of the lower link, the height of the work equipment connection point, its lift height, the height of the top link attachment point, etc. will differ. Therefore, if a work implement for another model was installed, the universal joint shaft that connects the tractor's PTO shaft and the work implement's blade shaft would no longer move equiangularly, making it impossible to maintain the desired performance.

The present invention solves these conventional problems, and its features include a top link mount protruding from the tractor body, a top link holder protruding from the mount, and a top link holder protruding from the mount. In a three-point linkage mechanism in which the top link is pivotally attached to the protruding end of the holder, the holder is pivotally supported at one end in the vertical direction of the mounting base so as to be able to swing freely around the horizontal axis, and the pin hole in the mounting base is installed below the road. A plurality of pin holes are arranged in the downward direction of the road at the base end of the holder, and one of the pin holes matches the corresponding pin hole of the mounting base at each swing position of the holder. The holder is provided with mounting pins that are selectively inserted into and removably inserted into a pair of corresponding pin holes in the base and the holder to fix the holder at each swing position.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
In the figure, 1 is a tractor body, 2 is a hydraulic system for lifting and lowering a working machine, and has a pair of lift arms 3.

Reference numeral 4 denotes an auger ditch excavator as an example of a working machine for a special three-point linkage mechanism, which comprises a machine frame 5 equipped with an auger 6, an auger tube 7, a hopper 8 for storing filler material, etc. The auger 6 is driven by the power transmitted from the shaft via the universal joint shaft to excavate the groove 9.

Reference numeral 10 denotes a special three-point link mechanism, which includes a pair of left and right lower links 11 and one top link 12, and the lower link 11 connects to the lift arm 3 via a lift rod 13.
is connected to.

The lift rod 13 is as shown in FIGS. 2 and 3.
A ball joint 15 is provided at the upper end of the rod 14, and this rod 14
Slightly bend the lower end of the U metal fitting 17.
and a triangular reinforcing plate 18 is welded between them.
The structure is such that it comes into contact with the connecting pin 19 and also serves to prevent the connecting pin 19 from rotating.

The top link 12 has a turnbuckle shape and is extendable and retractable, and is removably connected to the rear end of the top link holder 220 by a mounting pin 23, as shown in FIGS. 4 and 5.

The top link holder 22 consists of two plates with approximately triangular sides.
This top link holder 22 is connected to the top link mounting base 22 on the tractor body 1 side at the upper end of the front end side.
It is pivotally mounted to the mounting pin 25 so that it can swing vertically.

There is a mounting pin 2 on the front edge side of the top link holder 240.
5, four pin holes 26 are arranged at predetermined intervals in the far and near directions.
, 27, 2B, and 29 are formed, and the top link holder 22 is attached to the mounting pin 2 on the top link mounting base 24 side.
Four pin holes 30, 31, 32, 33 are provided at required intervals in the vertical direction so as to correspond to the respective bottle holes 26, 27, 28, 29 when the pin holes 26, 27, 28, 29 are vertically swung by a required angle α around 5. The mounting pins 34 can be inserted into and removed from the corresponding bottle holes, and when the mounting pins 34 are inserted, the top link holder 22 is fixed at a predetermined swing position.

In this case, the mounting pin 2 at the rear end of the top link holder 22
The three positions are vertically displaced by a height h, and each height is appropriately set according to the difference in tire diameter.

Therefore, if we assume that the solid line position of the mounting pin 23 shown in FIG.
is to be attached to the special three-point link mechanism 10 of a tractor for small diameter tires, and if it is to be attached to a tractor for large diameter tires, the bottle hole 26 of the top link holder 22 should be connected to the bottle hole of the top link mounting base 24. 30, insert the mounting pin 34 across both pin holes 26 and 30, and fix the top link holder 22 at the solid line position.
Position 3 is the lowest position relative to tractor body 1, so
Even if the small-sized auger trenching machine 4 is mounted on the large-sized special three-point link mechanism 10, the mounted attitude of the auger trenching machine 4 can be maintained at a predetermined position.

For example, in the auger trench excavator 4, when the hopper 8 for storing filler material is made removable, the presence or absence of the hopper 8 is used to prevent the filler material in the hopper 8 from coming out when the hopper 8 is raised. However, it is necessary to change the mounting posture of the trench excavator 4.

In such a case, the top ring 12 itself may be expanded or contracted, but if the top link holder 22 is moved up and down and the position of the mounting pin 23 is adjusted, the top link 12
A similar function can be obtained by telescopic adjustment of the top link 12, and the adjustment can be a coarse adjustment as opposed to a fine adjustment of the top link 12.

Also, for adjustment, attach the top link holder 22 to the mounting pin 2.
Since this can be done by inserting and removing the mounting pin 34 with one unit connected to the top link mounting base 24 at 5, handling is very easy.

The mounting pin 25 may be provided on the lower end side of the top link mounting base 24 as shown in FIG. 6, or may be provided on both the upper and lower sides, and either one of them may be used.

The lower link 11 is designed according to the tire diameter,
If the tire diameter changes, the length will also change, so top link 1
Adjusting the length of step 2 alone cannot eliminate asymmetrical movement, vibration, etc. of the universal joint shaft.

Therefore, as shown in FIG. 7, the top link holder 22
A plurality of bottle holes 35 are formed in the rear end along the upper and lower edges of the rear end, so that vertical adjustment of the top link holder 22 and selective use of the plurality of bottle holes 35 are combined. By doing so, the range of adjustment becomes even wider, and the optimal mounting position can be selected for the size of the work machine, further improving the versatility of the work machine.

The selection of the bottle hole 35 should be made accordingly when installing the work machine, and whether to use the upper edge side or the lower edge side depends on the tire diameter or the length of the lower link 11, whichever is more important. It is better to decide based on the standard.

There are various types of working machines, such as rotary tillers.

As described above, in the present invention, the top link holder is pivoted so that it can swing up and down, and is fixed in each swinging state by the fixing means, so the top link attachment point can be changed arbitrarily. Therefore, even when installing a different model of work equipment, by changing the top link attachment point, it is possible to set the work equipment in the optimal mounting position, improving the versatility of the work equipment and always maintaining the specified performance. This allows stable work to be carried out.

In particular, in the present invention, the holder is pivotally supported at one end in the vertical direction of the mounting base so as to be able to swing around the horizontal axis, and a plurality of bottle holes are arranged in the mounting base in the direction of the lower edge of the road, and the base end of the holder is , a plurality of bottle holes arranged in the downward direction of the road, one of which matches a corresponding bottle hole of the mounting base at each swing position of the holder,
Equipped with a mounting pin that fixes the holder at each swing position by selectively inserting and removably inserting it into each pair of corresponding bottle holes of the mounting base and holder, It is possible to easily make fine adjustments to the boulder without narrowing the distance between the adjacent bottle holes, and even in this case, the strength of the part fixed by the mounting pin of the mounting base or holder is weakened. There is nothing to do.

In addition to being able to change the posture of the work equipment, the top link holder can swing up and down, so it can be changed while the work equipment is connected, making it very easy to handle when changing the position. It is.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention, with Figure 1 being an overall side view, Figure 2 being an enlarged view of the lift rod, and Figure 3 being a view in the direction of arrow A in Figure 2; Figure 4 is an enlarged side view of the main parts, Figure 5
This figure is a plan view of the same, and FIGS. 6 and 7 are side views showing other embodiments. 1... Tractor body, 4... Auger trench excavator, 10... Special three-point link mechanism, 11...
...Lower link, 12...Top link, 22...Top link holder, 23,25
, 34...Mounting pin, 24...Top link mounting base, 26-33...Bottle hole.

Claims (1)

[Scope of utility model registration request] In a three-point linkage mechanism, a top link mount is provided protruding from the tractor body, a top link holder is provided protruding from the mount, and the top link is pivotally attached to the projecting end of the holder. The holder is pivotally supported at one end so as to be able to swing freely around the horizontal axis, and the mounting base is provided with a plurality of pin holes in the downward direction of the road. In the swing position, one of them has a pin hole that matches the corresponding pin hole of the mounting base, and the holder is inserted and removably inserted into each corresponding pair of pin holes of the mounting base and the holder. A top link mounting device characterized by having mounting pins for fixing the top link at each swing position.