JPS6219457Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an auxiliary hydraulic pressure extraction device for a tractor.

As is well known, in a tractor, a hydraulic device for lifting and lowering the work equipment is installed at the rear of the tractor, and a torsion bar shaft support equipped with a shaft support is attached in a protruding manner to the back of the device, and a Some torsion bars can be freely connected to a link from the rear work equipment to the pivotable part of the torsion bar.In this case, if the rear work equipment has a hydraulic system, an auxiliary control valve is attached to the hydraulic system for raising and lowering the work equipment. The hydraulic piping from the valve is taken out backwards and the piping from the work machine side can be connected as appropriate.

However, in the conventional extraction device, the tail end of the extraction piping is supported by a uniquely protruding bracket, which is quite disadvantageous in terms of manufacturing cost.

This idea was devised to solve the above problem, and its purpose is to create a tractor with a structure for extracting hydraulic pressure that is very inexpensive and advantageous in manufacturing and assembly. In order to provide an auxiliary hydraulic pressure extraction device, its features include mounting a hydraulic device 4 for lifting and lowering a working machine equipped with a pair of left and right lift arms 5 projecting rearward at the rear of the tractor body 1; A shaft support 12 having a U-shape in plan view and having a pair of left and right shaft supports 12a is attached to the rear end of this hydraulic device 4, and a torsion bar 17 inserted and supported by the pair of shaft supports 12a is used to rotate the pair of shaft supports 12a. In a tractor that supports a top link mount 18 projecting downward between the shaft supports 12a and connects a pipe 9 having a connecting fitting 9a at the rear end to an auxiliary control valve 8 attached to the hydraulic system 4, the connecting fitting 9a is located above the top link mount 18 in a side view and approximately in the center between the lift arm 5 and the top link mount 18 in a plan view, and the pipe 9 is connected to the shaft support near the connection fitting 9a. Bracket 1 attached to 12a
This is the point supported in point 3.

This invention will be explained below using an illustrated example.

What is shown in FIGS. 1 and 2 is the rear part of an agricultural tractor. Reference numeral 1 denotes a tractor body, and the rear part of the tractor body 1 is constituted by a transmission case 2. As shown in FIG. At the rear end of the transmission case 2, a reduction gear case 3 with a protruding PTO shaft for driving the rear working machine is mounted in a protruding shape. A hydraulic device 4 for raising and lowering is installed.

The hydraulic device 4 is equipped with a pair of left and right lift arms 5 extending rearward, and a position/draft control lever 6 is installed upright on the front right side. An auxiliary control valve 8 with an auxiliary control lever 7 is mounted in a protruding manner. As shown in FIG. 2, a pair of extraction pipes 9 are sent out from the four locations of the auxiliary control valve 8, and each pair of the pipes 9, 9 is used for input and output.
One set of these pipings 9, 9 is taken out backwards along the vicinity of the upper right shoulder of the hydraulic device 4, and the other set is taken out backwards through the vicinity of the upper left shoulder of the hydraulic device 4, passing over the top of the hydraulic device 4. It has been taken out. 10 is a floor seat, and a seat 11 is placed on top of the floor seat.

On the other hand, the pair of pipes 9 are attached via a torsion bar shaft support 12 attached to the rear end of the hydraulic device 4 . Specifically, upwardly protruding brackets 13, 13 are removably attached to the rear end of each pivot support 12a, 12a of a U-shaped planar pivot support 12 having a pair of left and right pivot supports 12a, 12a.
A base portion of a connection fitting 9a for taking out the pipe 9 is inserted into and supported by each of the brackets 13 in a left-right relationship.
The connecting fitting 9a faces rearward and has a built-in so-called self-sealing joint, so that the plug 14 is closed when not needed.
is closed.

On the other hand, the left and right shaft supports 12a, 12a have left and right fixed cylinders 15, 15, and a movable cylinder 16 between them.
are coaxially provided, a torsion bar 17 is inserted between them, and the middle part thereof is connected to the movable cylinder 16, and a pair of left and right top link mounting bases 18 are suspended downward from the movable cylinder 16 itself. be.

A top link from the rear working machine is pivotally connected to this top link mount 18. Therefore, the work load is transmitted to the top link mount 18 through the top link, and the top link mount 18 is connected to the top link mount 18 via the torsion bar 17. By reacting back and forth, the draft control valve is responsively controlled through the lower feedback rod 19, etc., and the rear working machine is operated in the upward and downward directions.

The connection fitting 9a is the top link mounting base 1 when viewed from the side.
8, and approximately in the center between the top link mount 18 and the lift arm 5 in plan view.

The hydraulic pressure from the auxiliary hydraulic pressure extraction device is used, for example, to cause a hydraulic cylinder to actuate a gauge wheel attached to the rear rotary device, or to rotate the backhoe.

This idea is as described above, and therefore, it effectively utilizes a U-shaped shaft support that pivotally supports the top link mount via a torsion bar in the vicinity of the connection fitting of the piping for taking out the auxiliary hydraulic pressure. It is quite advantageous in terms of manufacturing because it is supported by the hydraulic system, and since it can be installed in a wide area at the rear rather than in a narrow place on the hydraulic system, it is convenient for assembly and disassembly, and it is also very convenient to attach it to piping connections. It has become something.

In particular, the piping connection fittings are located above the top link mount that protrudes downward from the torsion bar when viewed from the side, and approximately at the center between the top link mount and the lift arm when viewed from above. Therefore, install the top link mounting base on the rear side of the hydraulic system.
Although the structure is complicated due to the presence of lift arms, etc., it is easy to attach and detach the hose on the work machine side to the connection fitting, and it also prevents the hose from coming into contact with the top link, lift arm, etc. .

[Brief explanation of the drawing]

FIG. 1 is a rear side view of a tractor showing an example of this invention, and FIG. 2 is a plan view thereof. 1... Tractor body, 4... Hydraulic system, 8...
Auxiliary control valve, 9...Piping for extraction, 1
2... Pivot support, 13... Removal bracket, 18
...Totuplink mounting base.

Claims (1)

[Scope of utility model registration request] At the rear of the tractor body 1, a hydraulic device 4 for lifting and lowering a working machine is mounted, which is equipped with a pair of left and right lift arms 5 that project rearward, and at the rear end of this hydraulic device 4, a pair of left and right shaft supports 12a is provided. A shaft support 12 having a U-shape in plan view is attached, and the pair of shaft supports 12
A torsion bar 17 inserted into and supported by a torsion bar 17 supports a top link mounting base 18 projecting downward between the pair of shaft supports 12a, and a connecting fitting 9 is connected to an auxiliary control valve 8 attached to the hydraulic device 4 at the rear end.
In a tractor connected to a pipe 9 having a
The connecting fitting 9a is located above the top link mounting base 18 when viewed from the side and approximately at the center between the lift arm 5 and the top link mounting base 18 when viewed from above, and the piping 9 is connected near the connecting fitting 9a. An auxiliary hydraulic pressure extraction device for a tractor, characterized in that it is supported by a bracket 13 attached to the shaft support 12a.