JPH0140205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil filter for an internal combustion engine, particularly an internal combustion engine mounted exposed on a vehicle body, such as an internal combustion engine for a motorcycle or three-wheeled vehicle.

The oil filter of this type of internal combustion engine should be kept inside the oil filter so that it does not protrude from the engine body, and when inspecting and replacing the filter element.
It is desirable to prevent dirty oil from remaining and to prevent the remaining oil from contaminating the surrounding area.

In order to prevent the oil filter from protruding from the internal combustion engine body, an oil filter (for example, JP-A-52 -Refer to Publication No. 24639).

However, in the above-mentioned oil filter, the oil pump, the filter element housing recess, and the oil pan are connected by a tube installed outside the oil pan, so it is troublesome to assemble the oil pump tube, etc., and the seal is difficult to assemble. There are many locations and it is difficult to ensure proper oil pressure due to oil leaks, etc.

Also, since the filter element housing recess opens on the side of the oil pan, when you remove the cap from the opening and take out the filter element, dirty oil may remain inside the recess, or any remaining oil may remain inside the recess. Oil may drip.

There is an oil filter (see, for example, Japanese Utility Model Application Publication No. 148377/1983) in which the opening of the filter element accommodating recess is directed downward so that the filter element can be taken out while being received by the cap.

The above-mentioned oil filter does not drip oil when the filter element is inspected or replaced, but the filter element housing recess is provided directly in the housing of the internal combustion engine main body, and is suitable for small internal combustion engines installed in motorcycles and tricycles. There is no room in the housing to provide a filter element housing recess.

In view of the above points, the present invention is particularly effective for small-sized internal combustion engines that are mounted exposed on a vehicle body, and
It is an object of the present invention to facilitate processing and assembly of a connection part of an oil path to an oil filter, and to improve the accuracy of the connection part.

In order to achieve the above object, the present invention is provided with an oil pan separate from the case at the lower part of the crankcase, an opening is formed on the circumferential surface of the oil pan, and the inside of the oil pan is depressed to form an oil pan. An oil filter for an internal combustion engine, in which a filter element housing recess isolated from accumulated oil is provided in the oil pan, and a cap that closes the opening of the filter element housing recess is fixed to the oil pan by a fastening part. In the filter element housing recess, the opening of the filter element housing recess is provided on the bottom surface of the oil pan, an oil supply/discharge hole is provided on the top surface of the recess, and the opening is located on the dividing surface between the crankcase and the oil pan. A filter element is supported between the top surface of the crankcase and the cap, and an oil pan is installed at the bottom of the crankcase.
A supply/discharge hole on the top surface of the filter element housing recess;
It is characterized in that it is constructed so that the inlet and outlet of the oil passage facing the lower surface of the crankcase are butt-connected.

Oil is circulated by the operation of the oil pump accompanying the operation of the internal combustion engine, and while the oil passes through the oil filter through the inlet and outlet of the oil passage on the crankcase side and the oil supply and discharge hole in the filter element housing recess,
Filtered by a filter element.

To inspect or replace the filter element, loosen the fastening parts and remove the cap downward while holding the filter element. When the filter element is placed on the cap, the filter element is housed in the recess, and the cap is fixed to the bottom of the oil pan, an oil path is formed through the filter element.

The structure of the illustrated embodiment will be explained below.
1 is a motorcycle, 2 is a V-type two-cylinder horizontal internal combustion engine mounted on the body of the vehicle, 3 is a crankcase that also serves as a transmission case, and 4 is a separate body from the crankcase 3 and is bolted to the bottom of the case 3 15 The oil pan is removable in the vertical direction.

A filter element accommodating recess 5 is formed at the bottom of the oil pan 4. The filter element accommodating recess 5 is recessed into the oil pan and has an open bottom surface isolated from the oil accumulated in the oil pan.

An oil supply hole 8 and a discharge hole 6 are provided side by side on the top surface of the filter element housing recess 5 . Each of the holes 6 and 8 is located on the dividing surface between the crankcase 3 and the oil pan 4 and is open. The inlet of the main oil passage 7 for crankshaft lubrication on the crankcase 3 side and the outlet of the return oil passage 9 are also located on the dividing plane.

When the oil pan 4 is installed under the crankcase 3, the drain hole 6 on the top surface of the recess 5 serves as the inlet of the main oil passage 7, and the supply hole 8 beside the drain hole 6 serves as the outlet of the return oil passage 9. and each match.

The lower opening of the recess 5 is covered with a cap 10, which supports a filter element 11 accommodated within the recess 5.

The cap 10 passes through the center thereof and passes through the center of the filter element 11 to the drain hole 6 on the top surface of the recess 5 (as shown in FIG. 3), or further passes through the drain hole 6 to the inlet of the main oil passage 7 on the crankcase side. (Example in Fig. 2) It is fixed by a screwed bolt 12.

In the case of the embodiment shown in FIG. 2 above, the oil filter cap 10 and the oil pan 4 are fastened together, the oil filter discharge hole 6 and the inlet of the main oil passage 7 on the crankcase side are in close contact, and the abutting surfaces of both mouths are in close contact with each other. This completely prevents oil leakage.

The bolt 12 has a tubular shape, and has a large number of small holes 13 on its circumferential surface communicating with the inside and outside.The oil enters the recess 5, that is, the oil filter chamber, from the oil passage 9 through the supply hole 8, and is filtered by the filter element 11. , flows through the small hole 13, the hollow passage 14 of the bolt 12, and the discharge hole 6 to the main oil path 7.

In particular, as shown in the illustrated example, the oil filter of the present invention is arranged below the front cylinder 21 in the crankcase 3.
Because the starter motor 16 was installed on the front of the
It is suitable for V-type multi-cylinder horizontal internal combustion engines where there is no room to install an oil filter not only on the outside front of the crankcase but also on the crankcase itself.

In the oil filter of the present invention, as described above, the opening of the filter element housing recess 5 which is recessed into the oil pan 4 is provided on the bottom surface of the oil pan 4, and the oil supply/discharge hole is provided on the top surface of the recess 5. 8 and 6 on the dividing surface of the crankcase 3 and oil pan 4, and when the oil pan 4 is attached to the crankcase 3, the filter element housing recess 5
Since the supply/discharge holes 8, 6 on the top surface of the crankcase 3 and the inlet/outlet ports of the oil passages 9, 7 facing the bottom surface of the crankcase 3 are butt-connected, the dividing surface between the crankcase 3 and the oil pan 4 and the crankcase Machining is easy because the butt connection surfaces between the inlet/outlet of the oil passages 9, 7 on the case 3 side and the oil supply/discharge holes 8, 6 on the oil pan 4 side can be machined in the same plane. Accuracy is also improved.

Therefore, compared to conventional oil filters in which the oil passage is connected outside the oil pan, the oil passage for the oil filter is formed inside the oil pan at the same time as the oil pan is attached to the crankcase, making it easier to assemble. An oil filter with fewer sealing points and no fear of oil leakage can be obtained.

Furthermore, when inspecting or replacing the filter element, since the filter element is attached and removed vertically while being held in the cap, remaining oil does not drip and the surrounding area is not contaminated.

Since the oil filter mentioned above is installed inside the oil pan, it is effective when implemented in internal combustion engines such as motorcycles where there is no room to install an oil filter buried in the crankcase or other housing parts due to its small size. There is.

[Brief explanation of drawings]

FIG. 1 is a side view of a motorcycle, FIG. 2 is a partially longitudinal side view of an internal combustion engine equipped with the oil filter of the present invention, and FIG. 3 is a longitudinal side view of another embodiment of the oil filter. 1 is a motorcycle, 2 is an internal combustion engine, 3 is a crankcase, 4 is an oil pan, 5 is a filter element housing recess, 6 and 8 are supply and discharge holes, 7 and 9 are oil passages, 1
0 is the cap, 11 is the filter element, 12
1 is a cap fastening part, 13 is a small hole, and 14 is a passage.

Claims (1)

[Claims] 1. An oil pan separate from the case is provided in the lower part of the crankcase, and an oil pan is opened on the circumferential surface of the oil pan, and the oil is sunken inward and collected in the oil pan. An oil filter for an internal combustion engine in which an oil pan is provided with a filter element accommodating recess separated from the filter element accommodating recess, and a cap that closes the opening of the filter element accommodating recess is fixed to the oil pan by a fastening part. An opening of the recess is provided on the bottom surface of the oil pan, an oil supply/discharge hole is provided on the top surface of the recess, and the opening is located on the dividing surface between the crankcase and the oil pan, and the top surface of the filter element housing recess and the When the filter element is supported between the cap and the oil pan is installed at the bottom of the crankcase, the supply/discharge hole on the top of the filter element housing recess and the entrance/exit of the oil passage facing the bottom of the crankcase will match up. An oil filter for an internal combustion engine, characterized in that the oil filter is connected to the oil filter.