JPS5815243Y2 - Hydraulic oil dust removal device for tractors - Google Patents

Description

[Detailed description of the invention] This invention adsorbs and removes magnetic particles mixed in the hydraulic oil in tractors that share the hydraulic oil that operates the hydraulic piston to raise the work equipment and the lubricating oil in the transmission case. This relates to a dust removal device for cleaning.

Tractors that share hydraulic oil and lubricating oil have the great advantage of simplifying the oil distribution piping structure, but the meshing and sliding movement of the many change gears in the transmission case can cause iron powder to Although small amounts of magnetic powder such as are constantly generated, it is necessary to constantly remove this magnetic powder.

Therefore, in this invention, a control pulp is installed at the bottom of the cylinder case, which contains a hydraulic piston for raising the work equipment and is attached to the upper part of the transmission case, to control the supply and discharge of pressure oil to the hydraulic piston. A case is installed in the transmission case so as to be located below the cylinder case, and the control pulp and the magnet for dust removal are housed inside the case, and the magnet can be inserted into the case from outside the cylinder case. and an oil outflow hole is provided in the upper part of the case near the magnet, so that the hydraulic oil discharged from the control pulp is sufficiently stagnated until it flows out from the oil outflow hole in the upper part of the case. During this time,
It is devised so that the magnetic powder is attracted by the magnet and is thoroughly cleaned.

To explain the specific structure based on the illustrated embodiment, the piping system of the tractor to which this invention is applied is as shown in FIG. The cylinder case 3 housing the hydraulic piston 2 is attached to the upper part of the transmission case 4, and the cylinder case 3 is connected to the hydraulic piston 2 so as to rotate upwardly when the piston 2 is extended. The hydraulic oil is sent to the control valve 7 using a hydraulic pump 6 driven by the engine 5, and the spool 8 of the control valve 7, which is slid by an operation lever not shown, is activated by the high pressure supplied from the hydraulic pump 6. It has a structure in which oil is sent into the cylinder case 3 or hydraulic oil in the cylinder case 3 is discharged into the transmission case 4 via the control valve 7.

Therefore, in this invention, a control valve 7 is attached to the lower part of the cylinder case 3, as shown in FIG.

Then, a cylindrical magnet 9 with permanent magnetic force is attached to one end of a screw cap 11 having a larger diameter than the magnet 9 using a mounting bolt 10, and the magnet 9 is inserted through a screw hole of an internal thread 3a provided in the cylinder case 3. Insert the control valve 7 into the transmission case 4 and screw the male thread 11a of the screw cap 11 into the female thread 3a.
A magnet 9 is located near the transmission case 4, so that the magnet 9 can be inserted into or removed from the upper part of the transmission case 4 through the screw hole of the female thread 3a.

A rectangular lower case 12 with an open top covers the lower part of the control valve 7 and the magnet 9, and the spool 8 is formed so as to be allowed to move in and out through a hole 12a provided in the lower case 12. A lid-shaped upper case 13 that can be externally fitted onto the upper part of the case 12 is provided with a hole 13a that can be fitted almost tightly onto the upper part of the control valve 7 and an oil spill hole 13b that is large enough to allow the magnet 9 to pass through, and the upper case 13 is attached. It is attached to the lower part of the cylinder case 3 with bolts 14, and the hole 13a fits into the upper part of the control valve 7, and the spool 8 is inserted through the hole 12a.
Attach the lower case 12, which is fitted into the case 13 so as to cover the lower part of the control valve 7, to the control valve 7 using the mounting bolts 15 while causing the lower case 12 to protrude.
If installed at the bottom of the upper case 13 and lower case 12
The case 16, which is made up of mission case 4
It was made so that it could overflow inside.

Next, the case 17 of the other embodiment shown in FIG. The stay pipe 18... is fixed to the bottom inner surface of the control valve 7, and the stay pipe 18... is fixed to the bottom inner surface of the control valve 7.
By screwing the mounting bolts 19 inserted into the stay pipes 18 into the cylinder case 3 while supporting them with the ..., the control valve 7 and the case 17 will be installed on the bottom surface of the cylinder case 3. Also, since this case 17 covers the magnet 9, the hydraulic oil flowing out from the oil drain hole 7a of the control valve 7 rises around the magnet 9 and flows through the oil drain hole 17b to the transmission case 4.
This has the advantage that the mounting structure of the case 17 is very simple.

Therefore, the hydraulic oil sucked from the hydraulic pump 6 becomes high pressure and is sent to the control valve 7. When the operator operates an operating lever (not shown), the hydraulic oil that has passed through the control valve 7 is transferred to the hydraulic piston 2 of the cylinder case 3. , the lift arm 1 is raised and rotated to raise the work machine, and conversely, by operating the operating lever, the hydraulic oil that was sent into the cylinder case 3 returns to the control valve 7, increasing the pressure. Since the hydraulic oil that has lost its capacity is discharged into the case from the oil discharge hole 7a of the control valve 7, this hydraulic oil is absorbed by the magnet as shown by the arrows in Fig. 1, Fig. 2 A, and Fig. 4 A, respectively. 9, the oil in FIG. 2A will overflow into the transmission case 4 from the oil spill hole 13b, and the oil in FIG.
The oil overflows into the transmission case 4 from the oil outflow hole 17b in the upper side wall of the engine.

When this hydraulic oil rises around the magnet 9, magnetic powder such as iron powder mixed in the hydraulic oil is adsorbed to the magnet 9, so it overflows into the transmission case 4 from the oil spill hole 13b or 17b. The hydraulic oil is sufficiently purified, and the meshing and sliding operations of the change gear in the transmission case 4 are not obstructed, and the opening/closing and sliding operations of the various valves in the control valve 7 are also performed smoothly. It is something.

The magnet 9 can be easily removed from the female thread 3a of the cylinder case 3, and since it is attached to the top of the transmission case 4, it can be used at any time without draining the hydraulic oil in the transmission case 4. By removing the magnet 9, the adhered magnetic powder can be removed, and the hydraulic oil can be maintained in a clean state.

Since the hydraulic oil dust removal device according to this invention is configured as described above, the hydraulic oil discharged from the control valve 7 is sufficiently stagnated until it comes out from the oil outflow hole at the top of the case. The magnetic particles can be efficiently adsorbed and removed by the magnet, and the hydraulic oil is sufficiently cleaned.

[Brief explanation of drawings]

Fig. 1 is a piping system diagram in a hydraulic oil dust removal device according to this invention, Fig. 2 A is a longitudinal sectional front view showing one embodiment of the device devised above, and the opening in the figure is a cross section taken along line A-A in Fig. A. figure,
3 is an exploded perspective view showing the state in which the magnet is removed from the case in FIG. 2A, FIG. It is a BB line sectional view in . Explanation of symbols, 1... Lift arm, 2...
...Hydraulic piston, 3...Cylinder case, 3
a...Female thread, 4...Mission case, 5...Engine, 6...Hydraulic cylinder f, 7...Control valve , 7a...
...Oil drain hole, 8...Spool, 9...
...Magnet, 10, 14.15...Mounting bolt, 11...Screw cap, 11a...
... Male thread, 12 ... Lower case, 12a, 13
a, 17a...hole, 13...upper case, 13b, 17...oil spill hole, 16.1
7...Case, 18...Stay pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] 10. A control for controlling the supply and discharge of pressure oil to the hydraulic piston at the bottom of the cylinder case, which is installed at the top of the transmission case and contains a hydraulic piston for raising the working machine. A valve is provided, and a case is installed in the transmission case so as to be located below the cylinder case, and the control valve and a dust removal magnet are housed inside the case, and the magnet is inserted into the case from outside the cylinder case. A dust removal device for hydraulic oil in a tractor, the device being provided so as to be inserted into the case, and having an oil outflow hole in the upper part of the case close to the magnet. 2. The hydraulic oil dust removal device for a tractor as set forth in claim 15, wherein the case is attached to the cylinder case using a mounting bolt that attaches the control valve to the cylinder case.