JPS587046Y2 - Oil filter mounting device for internal combustion engine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil filter mounting device for an internal combustion engine, such as one mounted on a tiller tower, which uses the bottom of a gear case or crankcase as an oil reservoir.

Conventional oil filters installed at the bottom of internal combustion engines include those in which the lubricant suction pipe as described in Japanese Utility Model Publication No. 46-31295 is used as a filter, and the suction pipe is attached to the side cover of the crankcase, A system in which a drain plug and an oil filter are integrally formed as described in Publication No. 53-12923 has been proposed, but in the former case, the side cover must also be removed each time the oil filter is removed. , the oil filter has the disadvantage of being troublesome and time-consuming to install and remove.On the other hand, in the latter case, although the oil filter has the advantage of being easier to install and remove compared to the former, the plug and filter are integrated. Since the overall length is longer and the extraction stroke becomes larger, additional space is required for extraction, installation is restricted by location, and the filter may become damaged or clogged. When it becomes necessary to replace the drain plug, the drain plug must be replaced as a set even if it is not damaged, which inevitably increases costs.

Furthermore, in order to integrate the drain plug and oil filter, both must be made of the same material that can be brazed.
There is the inconvenience that dissimilar materials, such as iron and resin, cannot be used.

The lubrication system is a part with an important function in an internal combustion engine, and the oil pump and other lubricating oil supply locations are all highly precise locations. Improvements are equally desired from the viewpoints of improving vibration resistance and preventing air suction.

The present invention promptly responds to such demands and provides an oil filter mounting device that eliminates the various deficiencies described above. When the drain plug is removed, a spring causes the filter to protrude from the filter insertion hole, making it easier to remove the filter, and the spring absorbs engine vibrations, improving the filter's durability. The filter is characterized by a structure in which a pipe is provided in the filter, and the oil is absorbed from the opening side of the pipe to prevent air from being sucked in due to the slope of the oil surface. The specific contents of the devised oil filter mounting device will be explained in detail based on an actual case shown in the attached drawings.

FIG. 1 shows an example of the device according to the present invention, and in the figure 1
is the crank case, 2 is the gear case, 3 is the difference between the two cases 1 and 2, and 4 is the port l- on the side of the gear case 2.
5, the side cover attached by 5', 6 is the camshaft of the engine,
An oil pump 7 is provided at the outer end thereof, and is driven by the drive from the camshaft 6.

On the other hand, the lower part of the gear case 2 serves as an oil reservoir, and an oil filter insertion hole is provided passing through the gear case 2 and the side cover 4 in the oil reservoir portion, and an oil filter 8, which is a feature of the present invention, is inserted into the insertion hole. At one end, a spring 11 is interposed between the partition wall 3 and a spring seat at one end of the oil filter 8, so that the oil filter 8 is biased toward the side cover 4 and inserted. A cap portion of the oil filter 8 having an oil hole 10 is pressed in by screwing a drain plug 12 through a threaded groove provided in a part of the insertion hole.

Incidentally, when the drain plug 12 is screwed into the side cover 4 and the oil filter 8 is pushed in, an oil passage 13 is formed that communicates between the oil hole 10 of the oil filter 8 and the oil pump 7. When installed, the two can be supported in a position where they match and communicate.

FIG. 2 shows an example of the details of the oil filter 8, in which the outer periphery of a cylindrical perforated steel plate 18 is covered with a mesh body 17, and a pipe shorter than the perforated steel plate cylinder 16 is provided inside. 18 is built in with its end brazed to a flange 19 attached in a U-shape to the end of the steel plate cylinder 16 on the head side, and an oil hole 10 is provided on the outer periphery of the steel plate cylinder 16 on the head side. On the other hand, on the other side, a spring seat 20 is attached to the end of the steel plate cylinder 16 by crimping its circumferential edge in a U-shape in a recessed state. The spring 11 having a shape is fitted into the recess.

Of course, this structure is not limited and may be modified as appropriate within the scope of the purpose.

In particular, the internal pipe 18 is intended to prevent air from being sucked in when the engine is tilted, and is designed to allow oil flowing in from the perforated steel plate cylinder 16 to pass through in a U-shape to the oil hole 10 on the head side.
It is necessary to design the oil pump 7 so that it can reach the oil pump 7 more easily.

In the figure, 14 is a starting shaft, and 15 is a starting handle.

In the above embodiment, the oil stored at the bottom of the gear case 2 is filtered through the oil filter 8, becomes clean oil, passes through the oil passage 13 from the oil hole 10 on the head side, and is pumped to each required part by the trochoid type oil pump 7. However, when it becomes necessary to clean and replace the oil filter 8, first loosen the drain plug 12, and the oil filter 8 supported by the spring 11 will pop out from the filter insertion hole due to the biasing force of the spring 11, so that it can be easily cleaned and replaced. It can be removed and cleaned or replaced.

Note that the amount of protrusion at this time is determined by the strength of the spring, so use a spring with an appropriate strength in advance.

Also, if you want to change the amount of protrusion, you can change the spring as appropriate.

Next, when inserting the extracted oil filter into the insertion hole, contrary to the above, first insert the oil filter 8, bring the spring 11 at the tip into elastic contact with the partition wall 3, and then screw in the drain plug 12. If it is supported at a position where the oil passage 13 and oil hole 10 match, it can be easily inserted.

In this case, it is preferable to fix one end of the spring 11 to the spring seat 20 in advance in consideration of ease of insertion.

When the filter 8, which can be inserted and removed as described above, has a pipe 18 inside, it can prevent air intake due to the slope of the oil surface even if it is used in a machine whose engine is tilted, such as a tiller, and is extremely effective. It is.

That is, if the engine is tilted with the gear case 2 side up and the oil level of the lubricating oil stored at the bottom of the crank case 1 and gear case 2 is inclined as shown by the two-dot chain line in FIG. In the type without pipe 18, air is sucked into the oil pump 7 when the oil level A is tilted, whereas in the type with the pipe 18 built into the filter 8, when the oil level is the same as this, air is sucked into the oil pump 7. There is no air suction until the inclination of surface A' is reached, and at the same angle of inclination as oil level A, there is no air suction until the oil level drops to oil level B. Eventually, the inclination range during normal use In this case, the action of the pipe 18 prevents air from being sucked in.

As is clear from the above-mentioned structure, the present invention provides an oil filter insertion hole in the lower part of the crankcase or gear case and the lower part of the side cover, and inserts a spring at one end so that the oil filter can be inserted by screwing in the drain plug. Therefore, when the drain plug is removed, the oil filter will pop out due to the spring, and therefore,
It is much easier to take out the filter, clean it, and replace it than with conventional filters, and the spring can also absorb engine vibrations, improving not only the durability of the filter but also its vibration resistance. In addition, since the oil filter and plug are separate, the extraction stroke is small, saving space for extraction, and there is no restriction on installation position as with conventional methods, and it is possible to use different types of oil. This makes it possible to use materials and replace only the filter, thereby reducing costs.

Note that when a pipe is provided in the oil filter, if the oil is absorbed from the opening side of the pipe, there is also the advantage that air suction due to the slope of the oil surface can be prevented.

The mounting device of the present invention is particularly effective when applied to an internal combustion engine mounted on a tiller, but is not limited thereto, and is equally effective when applied to other internal combustion engines.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the mounting device of the present invention, and FIG. 2 is a partially enlarged sectional view showing an example of an oil filter. 1... Crank case, 2... Gear case, 3... Bulkhead, 4... Side cover, 6...
...Camshaft, 7...Oil pump, 8.
... Oil filter, 9 ... Cap, 10 ... Oil hole, 11 ... Spring, 12
...Drain plug, 13... Oil passage, 16... Cylindrical perforated steel plate, 17...
Reticular body, 18... Internal pipe, 20...
・Spring catch.

Claims (1)

[Scope of utility model registration request] 1. In an internal combustion engine that uses the bottom of the gear case or crankcase as an oil reservoir, an oil filter insertion hole is provided in the gear case or crankcase and the side cover on its side, and a spring is fixed to one end through the insertion hole, and the oil filter is fixed to the other end through the insertion hole. An oil filter with an oil hole formed on the head side is attached by forcing it toward the side cover side, and an oil passage communicating with the oil pump is bored in the side cover, and the oil filter on the side cover is attached. A drain plug screw groove is provided in a part of the insertion hole, and the drain plug is screwed into the oil filter, and the oil filter is inserted at a position where the oil hole of the oil filter and the oil passage of the side cover match and communicate with each other. An oil filter mounting device for an internal combustion engine, characterized in that it is configured to be supported by a drain plug and a spring. 2. The oil filter is a cylindrical perforated steel plate whose outer periphery is coated with a net-like body, while a spring seat is formed on one end, a cap is attached to the other end, and there is a filter inside to prevent air from being sucked in. An oil filter mounting device for an internal combustion engine according to claim 1, which comprises a pipe.