JPS6215599Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a filter cylinder take-out device for filtering oil in an oil case such as a transmission case to remove foreign substances such as iron.

Generally, in this type of oil case, it is necessary to remove foreign substances such as iron powder mixed in the oil, and for this purpose, a filter tube is attached to the oil outlet opened in the oil case, and the oil is discharged from the outlet. There is a method that removes it by passing it through. However, conventionally, this type of filter tube is attached to the lower part of the oil case, and therefore, when removing the filter tube, the oil must be drained from the oil case in advance, making it troublesome to attach and remove the filter tube. Therefore, a method has been proposed in which the filter tube is inserted from the top side of the oil case and fixed to the oil case side, but in this case, although there is no need to drain the oil, there is a discharge port that communicates with the oil pump side. In order to prevent oil mixed with foreign matter such as iron powder from being discharged from the outlet in communication with the oil case, it is necessary to provide an opening/closing mechanism that can close the outlet. There is a new drawback of inconvenience.

The present invention was devised to eliminate these drawbacks in view of the above-mentioned actual situation, and although the filter tube is detachably fixed to the oil case from the top side, the filter tube is The outlet, which is in communication at the installation position, can be automatically closed at the filter tube removal position.
There is no opening/closing mechanism that you may forget to operate.
It is an object of the present invention to provide a filter cylinder removal device that can reliably prevent oil mixed with foreign matter from being discharged from a discharge port.

The structure of the present invention will be explained based on an embodiment shown in the drawings. 1 is a running body of an agricultural tractor in which the present invention is implemented, and a transmission case 2 is provided at the rear of the running body 1. It is being A cylindrical guide body 3 is provided on the inner bottom surface 2a of the mission case 2 to project upward. A valve body 4 is loosely fitted into the guide body 3 and is vertically slidable using the inner circumferential surface of the guide body 3 as a guide surface. In this embodiment, the valve body 4 is made of a material lighter than the specific gravity of the oil in the transmission case 2, and the valve body 4 automatically rises along the guide body 3 due to the buoyancy of the valve body 4. It's becoming like that. Reference numeral 5 denotes a regulation guide that restricts rotation of the valve body in the circumferential direction when the valve body 4 moves up and down.

The guide body 3 is provided with a discharge port 6 that communicates with the bottom plate of the transmission case 2 from the inside of the guide body 3, and this discharge port 6 is connected to an oil pump (not shown) via an oil hose 7. ing. On the other hand, the valve body 4 is provided with a communication hole 4a that communicates from the upper surface of the valve body 4 to the discharge port 6 side. Reference numeral 8 denotes a filter tube, and the upper part of the filter tube 8 is screwed onto the upper surface of the mission case 2 so that it can be detachably attached to the inside of the mission case 2. 8, the upper surface of the valve body 4 comes into contact with the lower part of the filter tube 8 and is pressed, and the valve body 4 reaches the upper limit position where the lift is stopped by the stopper 9 while the filter tube 8 and the communication hole 4a remain in communication. The communication hole 4 is forcibly lowered from the
a is located at a communicating position communicating with the discharge port 6. On the other hand, when the filter cylinder 8 is removed, the valve body 4 automatically rises due to buoyancy, and reaches the upper limit position where the discharge port 6 is closed by the valve body 4, that is, between the communication hole 4a and the discharge port 6. It is arranged to be located at a non-communicating position where the communication state is cut off.

In the figure, reference numeral 10 indicates an oil hole drilled in the lower part of the guide body 3, and reference numeral 11 indicates a fixing bolt for fixing the oil hose 7.

Next, the operation of the present invention constructed as described above will be explained. When the aircraft is running, the oil in the transmission case 2 is forced to pass through the filter tube 8 attached to the transmission case 2 to remove foreign substances by the operation of an oil pump (not shown). The valve body 4 is lowered and reaches the communication hole 4a in the communication position through the discharge port 6 to the oil hose 7, and the oil free of foreign matter is circulated and supplied to the mission case 2 again by the oil pump.

In this way, when cleaning or replacing the filter tube 8 due to foreign matter adhering to the filter tube 8 and clogging, etc., the filter tube 8 is removed from the transmission case 2.
In that case, when the filter tube 8 is removed from the transmission case 2, the filter tube 8 and the valve body 4 are separated from each other, but since the valve body 4 is made of a substance lighter than oil, , it rises by its own buoyancy and is located at a non-communicating position where it stops at the stopper 9. In the non-communicating position of the valve body 4, the discharge port 6 is blocked by the valve body 4, so even if the transmission case 2 is filled with oil, this unused oil flows from the discharge port 6 toward the oil pump. There will be no inflow into the country. Therefore, the filter cylinder 8 can be taken out and cleaned in the filled state without draining the oil from the transmission case 2 to remove attached foreign matter.
Then, when the filter cylinder 8 that has been cleaned is screwed onto the mission case 2, the valve body 4 that had been blocking the discharge port 6 is forcibly lowered again, and the discharge port 6 is closed to the communication hole 4.
It is located at a communicating position communicating with a and performs over-action of oil. During the installation work of the filter tube 8, the valve body 4 is automatically lowered to the communicating position in conjunction with the screwing of the filter tube 8, so that excess oil containing foreign matter is removed. It does not flow into the discharge port 6. Therefore, when attaching and detaching the filter tube 8, the valve body 4 automatically opens and closes the discharge port 6 when the filter tube 8 is attached and detached. You will never forget to close it.

The valve body of this example is designed to be automatically displaced from the communicating position to the non-communicating position by buoyancy, so it is made of a material with a specific gravity lighter than oil, but it is hollow. In addition, in order to automatically displace the valve body to the non-communicating position, the valve body is not limited to one that utilizes buoyancy; for example, as shown in Fig. 4, the valve body may have a light specific gravity. 4 and the bottom surface 2a of the transmission case.The key point is that the valve body is automatically moved to a non-communicating position where the discharge port is closed when the filter cylinder is removed. It suffices as long as it moves to .

In summary, the present invention provides a guide body with an oil outlet drilled below a filter tube that is inserted into the oil case from the top side of the oil case and is detachably fixed to the oil case. A valve body having a communication hole that is slidably and loosely fitted into the body is disposed, and the valve body, which communicates with the oil outlet at the attachment position of the filter cylinder to the oil case, is moved to the removal position of the filter cylinder. Since it is designed to be able to move up and down in order to automatically close the discharge port during evacuation, when attaching and removing the filter tube, it is necessary to take out the filter tube from the top side of the oil case and drain the oil from the oil case. However, when the filter tube is installed, the valve body that communicates with the discharge port automatically moves up and down when the filter tube is removed to close the discharge port, so the discharge port cannot be operated. Without the need for an easy-to-forget opening/closing mechanism, it is possible to reliably prevent unfiltered oil from being automatically discharged from the outlet when attaching or removing the filter tube, and the filter tube can always be removed without mistakes. It is something.

[Brief explanation of the drawing]

The drawings show an embodiment of the filter cylinder take-out device according to the present invention, in which Fig. 1 is an overall side view of an agricultural tractor, Fig. 2 is a vertical sectional view of the main part, Fig. 3 is an explanatory diagram of the operation, FIG. 4 is a longitudinal sectional view of a main part showing another example. In the figure, 2 is the mission case, 3 is the guide body, 4
is a valve body, 4a is a communication hole, 6 is a discharge port, and 8 is a filter cylinder.

Claims (1)

[Scope of utility model registration request] A guide body with an oil outlet is provided below the filter cylinder, which is inserted into the oil case from the top side of the oil case and removably fixed to the oil case. A valve body having a fitted communication hole is provided, and the valve body communicates with the oil outlet at the attachment position of the filter tube to the oil case, and the outlet is automatically closed when the filter tube is retracted to the removal position. A filter tube removal device characterized in that it is provided so as to be able to move up and down as much as possible.