JPS5838161Y2 - Oil supply device for traveling work vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil supply device for supplying oil from an oil tank toward a fuel pump and other fuel pumps in a traveling work vehicle.

An oil strainer for cleaning the oil supplied from the oil tank to two types of oil pumps in mobile work vehicles.
It is already known to simplify the structure of the oil supply mechanism by forming a single oil strainer, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 48-36510. When installing an oil strainer, two types of oil pumps are installed in parallel to each other in order to connect the inside of the oil strainer to two types of oil supply pumps.
The problem is how to provide two oil supply passages.

In other words, an oil strainer is generally configured to introduce cleaned oil from the inside through a mouthpiece at one end of the strainer, but two oil supply pipes are connected to the base end of the strainer to form two parallel oil supply passages. This is because it is difficult to centrally connect the strainer to the oil tank in the narrow metal part.

In this regard, the above-mentioned Utility Model Application Publication No. 48-36510 has an oil strainer with caps at both ends, and such an oil strainer is installed upright in an oil tank. The oil supply passages are led out from the upper end mouthpiece portion and the lower end mouthpiece portion, respectively.

However, when the oil strainer is installed in an oil tank in an upright position, the oil level fluctuates due to vibrations of the oil tank when the vehicle is running or oil suction into the strainer due to pump force. As a result, the upper end portion of the oil strainer is likely to be exposed above the oil surface in the oil tank, and air is likely to be sucked into the oil supply pump, resulting in increased cavitation.

Therefore, it is possible to horizontally install an oil strainer with caps on both ends inside the oil tank, but in general, in mobile work vehicles, the transmission case is also used as the oil tank, and the oil piping is separated from other equipment tanks as much as possible. While there are circumstances where it is desirable to concentrate on one side of the mission case in order to avoid restrictions on placement or to prevent the operator from getting in and out of the work vehicle, the strainer described above With this arrangement, the oil piping inevitably ends up on one side and the other side of the transmission case, which also serves as an oil tank.

Furthermore, an oil strainer that is configured to have a cap at both ends and draw out oil from both ends has a more complicated structure and is more expensive than a normal type oil strainer that draws oil from only one end.

Next, let's look at conventional oil supply devices that guide oil from inside an oil strainer toward a single oil supply pump. In addition, there is an oil strainer installed inside the mouthpiece.
There is a structure in which an oil passage that communicates with the inside of the oil tank is bored in the wall of the oil tank, and such oil passage is guided at a position 1 where it is easy to connect an oil supply pipe.

In this latter structure, the oil supply pipe can be connected at a position that does not interfere with other pipes and facilitates the connection, but on the other hand, it is necessary to drill holes in the oil tank wall.

In view of the above-mentioned circumstances, this idea was developed to simplify the structure of the oil supply mechanism by using a single oil strainer for cleaning the oil supplied to the two types of oil supply pumps. , an oil strainer with a simple and inexpensive structure that draws oil from only one end is used, and such an oil strainer is installed horizontally in the oil tank to avoid problems with cavitation, and the oil supply pipe at - is connected to the strainer. It will be connected to the oil tank near the mouthpiece, but other oil supply pipes can be connected to the oil tank at other locations that are easy to connect.
However, it is an object of the present invention to provide a novel oil supply device for a traveling operator, which has a simplified structure so that it is easy to process and assemble.

The structure of the oil supply device according to the invention will be explained with reference to the illustrated embodiment.The illustrated embodiment is based on an agricultural tractor as shown in FIG. A worker sits on a seat 3 on the machine body and rotates the front wheels 1 using a steering wheel 4 to steer the tractor, and the rear wheels 2 are rotationally driven by an engine 5 at the front of the machine body. This is an example of implementation in an agricultural tractor in which the tractor is caused to travel, and the work equipment connected to the tractor is raised and lowered by a hydraulic lift mechanism 6 and is driven by a PT<) shaft 7. It is said to have a structure like this.

That is, a hydraulic clutch type transmission device (not shown) housed in the transmission case 8 is provided in the transmission path of running power from the engine 5 to the rear wheel axle 2a, and the oil supply device according to the invention is configured as a device for supplying hydraulic oil to the hydraulic clutch in the hydraulic clutch type transmission device and the lift cylinder (not shown) in the above-mentioned hydraulic lift mechanism 6, and is an oil tank constituting an oil supply source. is the lower portion 8a of the mission case 8 mentioned above.

As shown in FIG. 2, an opening 10 is formed in one side wall of this oil tank 8a.

This opening 10 is formed with a circular fitting hole 10a into which a mouthpiece 18 of an oil strainer 9 provided in the oil tank 8a is fitted.

The oil strainer 9 has a mounting 7 flange 19 that also serves as a lid plate at the end opposite to the base 18, and is inserted into the oil tank 8a from an insertion port 20 provided on the other side wall of the oil tank 8a. into the fitting hole 10a, and insert the cap 18 into the fitting hole 10a.
At the same time, the mounting flange 19 is fixed to the other side wall of the oil tank 8a with a fixture 21, and is horizontally installed in the oil tank 8a.

The inside of this oil strainer 9 is communicated with the opening 10 through the hole 9a of the mouthpiece 18.

The position of the oil strainer 9 within the oil tank 8a may be fixed in any manner.

The opening end of the opening 10 to the outside of the oil tank 8a is closed by a cover plate 11 mounted on the outer surface of one side wall of the oil tank 8a with a fixture 12.

In particular, by using this cover plate 11, the oil strainer 9
Two types of oil supply passages that communicate with each other are formed as follows.

That is, first, a concave groove 11a is formed on the inner surface of the cover plate 11 so that the concave groove 11a opens at both ends into the opening 10 and into the oil passage 13 in the bottom wall of the oil tank 8a when the cover plate 11 is installed. The groove 11a is provided on the inner surface of the cover plate 11.
An oil passage 14 is formed between the oil tank 8a and the outer surface of one side wall of the oil tank 8a, and the oil passage 14 is connected to an oil supply pipe 15 to an oil supply pump (not shown) that supplies oil to the hydraulic clutch. is connected to the end of the oil passage 13 on the bottom wall of the oil tank 8a to connect the inside of the oil strainer 9 in the direction of the oil supply pump.

In addition, the cover plate 11 is provided with a connection port 1T that opens into the opening 10 in order to connect the inside of the oil strainer 9 to another oil supply pump (not shown) that supplies oil to the hydraulic lift cylinder. An oil supply pipe 16 formed therein and connected to the other oil supply pump described above is connected to the connection port 17.

Note that the opening 10 and groove 11a described above can be formed at the same time when the transmission case 8 and the cover plate 11 are cast, and the oil passage 13 in the bottom wall that is leftover can also be formed outside the mission case 8 as a single item. Since it is open, it can be formed simultaneously when the tension case 8 is cast.

In the figure, buttons 22 and 23 are seal rings, respectively.

As is clear from the above description, the oil supply device for a traveling work vehicle of this invention includes an oil strainer 9 in the oil tank 8a, and a base 18 of the kernel oil strainer 9 in the oil tank 8a.
The oil strainer 9 is fitted into a fitting hole 10a formed in an opening 10 on one side wall, and the inside of the oil strainer 9 is communicated with the opening 10, and the inside of the oil strainer 9 is horizontally installed. A cover plate 11 having a concave groove 11a on the inner surface between the outer surface of the side wall and the outer surface of the side wall to form an oil passage 14 for connecting the oil passage in the direction.
A cover plate 1 which forms an oil supply pipe connection port 17 for connecting the inside of the oil strainer 9 to another oil supply pump.
1 is mounted on the outer surface of one side wall of the oil tank 8a, and the opening end of the opening 10 to the outside of the oil tank 8a is closed by the lid plate 11. It has advantages.

In other words, the oil supply device of this invention aims to simplify the structure of the oil supply mechanism by using a single oil strainer for cleaning the oil supplied to two types of oil supply pumps. Advantages include the use of an oil strainer 9 with a simple and inexpensive structure that directs oil, and the fact that such an oil strainer 9 is installed horizontally within the oil tank 8a, and the oil strainer is installed vertically within the oil tank. The advantage is that it solves the problem of cavitation that easily occurs when
However, in order to use the oil strainer 9 of the type that draws oil from only one end as described above by installing it horizontally inside the oil tank 8a, the inside of the oil strainer 9 is It has the advantage that the structure for forming two parallel oil supply passages that communicate with each other is particularly simplified.

In other words, in the oil supply device of this invention, the oil supply pipe (-) is connected to the oil tank near the strainer mouthpiece, but the other oil supply pipes are connected to the oil tank at other locations where they can be easily connected, avoiding the vicinity of the narrow strainer mouthpiece. In order to connect the oil supply pipe connection port 17 in the lid plate 11, which will be located near the strainer cap, and the inside of the oil strainer, an oil passage is provided to connect the inside of the oil strainer to another position avoiding the vicinity of the strainer cap. 14 and
However, the above-described oil passage 14 is formed by a groove 11a on the inner surface of the cover plate 11, and the open end of the groove 11a is sealed with the outer surface of the side wall of the oil tank 8a. Since such a concave groove 11a can be integrally formed on the small cover plate 11 when the small cover plate 11 is cast, it is of course easy to form the oil supply pipe connection port 17 on the cover plate 11. Therefore, it is easy to form the oil passage and has a simple structure, and the oil tank 8
Immediately after the cover plate 11 is attached to the outer surface of the side wall of the oil tank to close the open end of the opening 10 of a, two parallel oil supply passages, the above-mentioned oil passage 14 and the oil supply pipe connection port 17, are opened. , is completed and formed, and is easy to assemble;
It also has a simple structure.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of an agricultural tractor equipped with an embodiment of this invention, and FIG. 2 is a longitudinal sectional view of the same embodiment. 8...Mission case, 8a...Oil tank, 9...Oil strainer-110...
... Opening, 10a... Fitting hole, 11...
...Lid plate, 11a... Concave groove, 12...
Fixing tool, 13... oil passage, 14... oil passage, 17. ...Oil supply pipe connection port, 18...
・Cap.

Claims (1)

[Scope of utility model registration request] An oil strainer is placed in the oil tank, and the mouthpiece of the oil strainer is fitted into a fitting hole formed in an opening provided in one side wall of the oil tank, so that the inside of the oil strainer is communicated with the opening,
A cover plate that is installed horizontally and forms an oil passage for connecting the inside of the oil strainer in the direction of the oil supply pump by means of a groove on the inner surface between the outer surface of the side wall and the inside of the oil strainer. A cover plate is attached to the outer surface of one side wall of the oil tank, and the cover plate forms an oil supply pipe connection port for connecting the oil supply pipe in the direction of another oil supply pump. An oil supply device for a traveling work vehicle that has an open end closed to the outside.