JPS6230814Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention relates to a support device for an external hydraulic outlet when extracting pressure oil from a hydraulic pump attached to a tractor and using it as driving force for a working machine. be.

(b) Prior art There are front loader devices, front dozer devices, backhoe devices, etc. as working machines that use an external outlet, but these working machines themselves are equipped with hydraulic control valve devices, and agricultural There is a tractor that utilizes the pressure oil after being controlled by using a hydraulic control valve device of the tractor.
In order to meet these various demands, various types of external hydraulic pressure outlets are provided.

Since this external hydraulic pressure outlet is not always used, it is opened at the bottom of the step device, and is normally closed by fitting a blind plug into the connection plug.

Conventionally, this connection plug was fixed by welding to the mounting stay provided below the step, which made the installation work during assembly a hassle, and the pipe could be deformed due to deformation of the step or mounting stay, and the connection on the external work equipment side The problem was that it was difficult to tighten the plug.

(c) Problems to be solved by the invention The purpose of this invention is to improve these problems by making the installation work easier during assembly and preventing the pipe from deforming due to deformation of the steps and installation stays. This configuration solves the problem of difficulty in tightening the connection plug on the external working machine side when taking out the pressure oil.

(d) Means for solving the problem The purpose of the present invention is as described above, and the configuration for achieving the purpose will be explained below.

At the ends of hydraulic outlet pipes 11, 12, 14, and 15 for supplying pressure oil generated by a hydraulic pump attached to the tractor to an externally installed work machine, a connection plug for hydraulic outlet with a diameter larger than that of the pipe is installed. 1
1a, 12a, 14a, 15a are fixedly installed, and the connection plugs 11a, 12a, 14a,
Via the annular rubber 28 fitted around the outer periphery of 15a,
Mounting stay 2 provided below steps 20 and 21
3, 24, and 25.

(E) Embodiments The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the embodiments shown in the attached drawings.

Figure 1 is a side view showing the hydraulic piping in the vicinity of the tractor's engine 1, clutch housing 8, transmission case 22, and rear axle case 9, Figure 2 is a plan view, and Figure 3 is a bottom view of the right step. FIG. 4 is a bottom view of the left step, and FIG. 5 is a drawing of the connecting plug and the supporting part of the mounting test.

Two hydraulic pumps 2 and 6 are provided at the front of the engine 1 and are driven by the engine 1. The hydraulic pump 2 is a hydraulic pump for power steering, and the hydraulic pump 6 is a hydraulic pump for a working machine according to the present invention.

The lubricating oil near the joint between the transmission case 22 and the rear axle case 9 is sucked as hydraulic oil by the oil filter 3a, the hydraulic oil is guided to the line filter 4 by the low pressure pipe 3, and after filtration, it is further transferred to the low pressure pipe 5. It is sucked and guided to the hydraulic pump 6.

Pressure oil made highly pressurized by the hydraulic pump 6 is guided into the hydraulic case 10 through high pressure pipes 7a and 7b. In normal cases, the pressure oil is controlled by a hydraulic control valve 10a attached to the tractor, and the hydraulic case 1
The hydraulic cylinder inside 0 is operated to expand and contract.

In this configuration, the pressure oil after being controlled by the hydraulic control valve 10a is transferred to the oil pipe 1 by a switching operation.
7. The return oil pipe 18 allows the oil to be taken out from the rear side of the hydraulic case 10.

Also, step 2 on the left side of the mission case 22
The piping is configured so that it can also be taken out through the oil sending pipe 12 and return oil pipe 11 on the lower side of the 0.

At the tip of each pipe 17, 18, 11, 12 there is a connection plug 17a with a slightly larger diameter than the pipe.
18a, 11a, 12a are fixed by welding,
These large diameter connection plug parts 17a, 18a, 11
An annular rubber 28 is interposed between a and 12a as shown in FIG. 5, and the annular rubber 28 is attached to the respective mounting stays 25 and 29 via the annular rubber 28.

Furthermore, when operating a single-acting hydraulic cylinder using pressure oil controlled by the hydraulic control valve 10a, only one pipe is required for sending and returning oil;
Since the connecting plug 16a attached to the mounting stay 27 at the tip of the hydraulic case 10 is provided on the left side of the hydraulic case 10, the hydraulic pressure can also be extracted from this external hydraulic pressure outlet.

In addition, if a control valve device is installed on the work machine side but there is no hydraulic pump, the control valve device 10a
The pressure oil before entering the system is taken out through an oil sending pipe 14 and a return oil pipe 15, and the hydraulic oil can be taken out to the outside below the step 21 on the right side of the mission case 22. Reference numeral 19 denotes a return oil pipe, to which a return oil port is connected when the hydraulic control valve device of the working machine has a large number of ports. The connection plug 19a of the return oil pipe 19 is attached to the annular rubber 2 on the mounting stay 24.
It is attached via 8.

Figure 3 shows step 2 on the right side of the mission case.
1, in which a hydraulic pressure external outlet is provided before being controlled by a hydraulic pressure control valve 10a attached to the tractor.

The connection plugs 14a, 15a of the oil supply pipe 14 and the return oil pipe 15 are attached via annular rubber members 28, 28 to the mounting stay 23 below the right-side step 21. The two connection plugs 14a, 15a of the oil supply pipe 14 and the return oil pipe 15 are arranged horizontally side by side.

FIG. 4 is a bottom view of the left step 20.
The external hydraulic outlet on this side is the outlet for the pressure oil after being controlled by the tractor's hydraulic control valve 10a, and the oil sending pipe 11 and return oil pipe 12 are attached at the connection plugs 11a and 12a. Stay 25
It is vertically attached via an annular rubber 28.

(f) Effects of the invention The present invention is constructed as described above, and has the following effects.

First, compared to the conventional method in which the tip of the pipe for external mounting is welded to the mounting stay, the installation work during assembly is easier, and even if the step or mounting stay deforms, the pipe will deform accordingly. There was nothing left to do.

Second, in the past, the hydraulic pressure pipes 11, 1
Attach the tips of 2, 14, 15 to the stays 23, 24,
It was difficult to assemble because it was fixed to the mounting stay 25, but in this invention, the mounting stay 23,
Connecting plug 11 for taking out hydraulic pressure externally from 24 and 25
Since parts a, 12a, 14a, and 15a can be removed, assembly can be facilitated.

Thirdly, the connection plug 11a, 1 for taking out the hydraulic pressure externally.
2a, 14a, 15a, and mounting stays 23, 2
Since the annular rubber 28 is interposed between 4 and 25,
Even if the step is bent each time you get on or off the step, the hydraulic pressure external extraction pipes 11, 12, 1
4, 15 and hydraulic pressure external connection plug 11a, 1
Therefore, deformation of 2a, 14a, and 15a does not occur.

It also provides anti-vibration support while driving.

Fourthly, since the small diameter pipe part is supported by the large diameter connecting plug part instead of being supported by the diameter stay, the mounting stays 23, 24, 25 and the hydraulic external connection plugs 11a, 12a, 14a,
15a, there is less chance of damage to the pipe.

[Brief explanation of the drawing]

Figure 1 is a side view showing hydraulic piping in the vicinity of the tractor's engine 1, clutch housing 8, transmission case 22, and rear axle case 9, Figure 2 is a plan view, and Figure 3 is a bottom view of the right step. FIG. 4 is a bottom view of the left step, and FIG. 5 is a drawing showing the support portion of the connection plug and the mounting stay. 1...Engine, 6...Hydraulic pump, 11,1
2, 14, 15, 16, 17, 18...Hydraulic pressure external extraction pipe, 11a, 12a, 14a, 15
a, 16a, 17a, 18a... Connection plug for external hydraulic pressure, 23, 24, 25, 27, 29...
Mounting stay, 28...annular rubber.

Claims (1)

[Scope of utility model registration request] At the tips of the hydraulic external extraction pipes 11, 12, 14, and 15 for supplying the pressure oil generated by the hydraulic pump 6 of the tractor to the externally installed working machine, a hydraulic external extraction connection plug having a diameter larger than that of the pipe is provided. 11
a, 12a, 14a, 15a are fixedly installed, and the hydraulic pressure external connection plugs 11a, 12a, 14a, 1
The mounting stay 2 provided below the steps 20 and 21 is attached via the annular rubber 28 fitted to the outer periphery of the step 5a.
A hydraulic external outlet support device for a tractor, characterized in that it is supported by 3, 24, and 25.