JPS6221695Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for an oil strainer that constitutes a lubricating device for an internal combustion engine.

In the engines of motorcycles and the like, oil is stored on the bottom of the crankcase, pumped up by a pump, and supplied under pressure to various lubricating parts via an oil filter. In the above lubrication system, oil is pumped up to the oil pump through an oil strainer installed on the bottom of the crankcase.
Since the oil strainer serves as an oil inlet, it is preferable to install it in the center of the bottom of the crankcase where the oil level does not change much.

However, in the past, when the oil strainer was disposed in the center of the crankcase, the oil strainer could not be replaced without disassembling the entire crankcase. For example, in a conventional left-right split crankcase, an oil strainer is disposed so as to span the joint between the left and right crankcase halves, and the oil strainer is supported by each half. . Therefore, when cleaning or replacing the strainer due to deterioration or clogging of the screen, it is necessary to completely divide the crankcase into left and right sides and remove the strainer, which becomes a large-scale work and is troublesome and complicated. It is.

Also, even if the crankcase is divided into upper and lower parts,
If the oil strainer is placed in the center,
It is impossible to replace the oil strainer unless the crankcase is split vertically to expose the entire oil strainer disposed in the center, and the problem is similar to that of a left-right split crankcase.

Therefore, the present invention solves the above problems and provides an oil strainer installation for an internal combustion engine in which the oil strainer is provided at or near the center of the crankcase, and the oil strainer can be replaced without completely disassembling the crankcase. The purpose is to provide structure.

The present invention was developed in view of the above.

That is, the present invention provides an oil strainer mounting structure for an internal combustion engine, which includes a crankcase in which the bottom of the crankcase constituting an oil pan is integrally formed, and a crankcase cover is removably fastened to the side surface of the crankcase. , an oil strainer mounting portion is provided at or near the center of the bottom of the crankcase constituting the oil pan, and the oil strainer is attached to the bottom of the crankcase through a locking member that is detachable from the crankcase cover side. It is characterized in that it is fixed to the mounting member.

In the present invention, when the oil strainer is arranged as centrally as possible in the crankcase to ensure smooth oil supply even when the oil level changes, the oil strainer is attached and detached from the crankcase cover side. This makes it possible to replace the oil strainer without completely disassembling the crankcase.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an example of a motorcycle equipped with an engine. To explain the outline of the motorcycle 1, a front fork 4 supporting a front wheel 5 is supported in a steerable manner via a head tube 3 at the front end of a frame 2. , there is a fuel tank 6 at the front upper part of the frame 2.
A seat 7 is arranged behind this, and a rear fork 8 supporting a rear wheel 9 is pivotally extended to the rear of the lower front part of the frame, and a rear fork 8 is provided between the rear fork 8 and the frame. A system unit 10 is interposed.

An engine 11 is mounted on the lower front part of the frame 2, and the engine 11 includes a crankcase 30, a cylinder block 12 raised above this, a cylinder head 13 above this, and a cylinder head cover 14 above this. In the embodiment, the rear half of the crankcase 30 also serves as a transmission case.

As clearly shown in Figure 3, the crankcase 30 consists of a left and right split assembly in which left and right crankcase halves 31 and 32 are joined together, and a crankshaft 15 and a transmission mechanism are housed inside the crankcase 30. The countershaft is shown. Figure 3 is 31
32 indicates the left half of the crankcase, and 32 indicates the right half of the same. In the lower part of the partition wall 311 of the left half body 31, oil passage openings 312 are formed on the left and right sides, and bearing parts 313, 314 are formed in the middle and upper part of the partition wall. is formed.

A support part 322 for the oil pump 17 is provided outside the middle part of the partition wall 321 of the right half 32, and a bearing part 323 for the crankshaft is provided at the upper part. is not expressed.

The left and right halves 31 and 32 have opposing inner end surfaces 3
15 and 324 are butted together and a gasket is interposed between them to join and integrate them.
The inner end surfaces 181, 191 of the covers 18, 19 are butted against the outer end surfaces 316, 325, and a gasket is interposed therebetween.
8 and 19 are integrated on the outside of the left and right halves 31 and 32.

A strainer mounting boss portion 327 is located on the bottom 326 of the right half 32 near the center of the crankcase in the width direction.
The boss portion 327 is provided with a through hole 328 that opens outward, and the inside of the through hole 328 communicates with a space 330 formed between the bottom 326 and the ceiling portion 329 of the boss portion 327. A through hole 331 communicating with the inside of the bottom 326 is provided on the inside of the boss portion 327 . A locking recess 333 is provided in the peripheral wall 332 defining the space 330 of the boss portion 327.
A through hole 32 that is completely open to the outside of the boss portion 327
A screw hole 334 is provided in the upper end surface of the boss portion 327, and a communication passage 335 connecting the space 330 and the oil pump 17 is provided in the lower part of the partition wall 321 at the upper center of the boss portion 327.

The oil strainer 20 is laterally inserted into the space 330 from the outside through hole 328 side of the mounting boss portion 327, and the strainer 20 is made up of a peripheral frame 201 and a screen 202 stretched over the peripheral frame 201.
1 is engaged and held in the engagement recess 333, and the peripheral frame 20
A plate-shaped bracket 203 is attached in advance to the outer end surface in the attached state of 1, and the upper part of this is made to protrude above the peripheral frame 201. It is tied to the hole 334. Thereby, the space 330 is divided into upper and lower parts by the strainer 20, and the upper part of the space 330, which is divided by the strainer 20, communicates with the oil pump 17 through a communication passage 335.

The above crankcase 30 is assembled into halves 31, 32,
Consisting of a joint of covers 18 and 19, each bottom 1
A predetermined amount of oil 302 is stored on the bottom 301 of the crankcase formed by 82, 317, 326, and 192 as an oil pan, and the level of the oil 302 is higher than the boss portion 327. The pump 17 is driven by a gear 171 by the engine output, and the shaft 172 of the pump 17 is connected to the bearing part 193 of the right cover 19.
The discharge passage 173 of the pump is supported by the partition wall 32
It is connected to a passage 336 provided in 1, further connected to an oil filter 22 having a cover 19 as a housing 194, and connected to various lubricating parts.

Next, to explain its use and effects in detail, oil 30
2 is stored on the bottom 301, and the oil is blocked in the upper half by the bracket 203 and the through hole 331 on the left side of the boss portion 327 provided offset from the center of the right crankcase half 32 toward the left half 31. The oil is supplied to the bottom of the strainer 20 from the lower part of the through hole 328, and pumped up by the drive of the pump 17.The oil is first filtered by the strainer 20 and sent to the pump oil filter 22, where it is filtered and lubricated. It is supplied under pressure to each part.

By the way, the strainer 20 is the crankcase 30.
Although it is provided on the bottom 326 of one of the halves 32, it is also provided approximately in the center of the entire case, thus suppressing the effects of oil level changes such as inclination as much as possible, and ensuring smooth oil flow. supply can be made.

In the above, the oil strainer 20 is assembled to the right half body 32 before the crankcase is assembled.
is free, and the strainer 20 is inserted into the outer through hole 328 of the boss portion 327 from the outer end surface 325 side of the half body 32.
and slide the peripheral frame 201 into the engagement recess 333 while supplying it. The strainer 20 can be installed within the boss 327 by simply placing the bracket 203 against the outer end surface of the boss 327 and screwing the bolt 21 into the screw hole 334 so as to define a space 330. The above can be done in the same way after assembling the left and right crankcase halves 31 and 32.
It is easy to assemble and has good assembling properties because it is just inserted from the side and bolted from the outside. When cleaning the strainer screen after assembly or replacing the strainer, remove the cover 19 on the right half side to expose the bolt 21. By removing this, the strainer can be pulled out and removed. Therefore, the strainer 20 can be easily replaced, resulting in excellent maintainability.

Although a horizontally split crankcase has been described based on the embodiments above, it goes without saying that the present invention has similar effects on a vertically split crankcase that also constitutes an oil pan.

As explained above, in the present invention, since the oil strainer can be attached and detached from the crankcase cover side, it is not necessary to disassemble the entire crankcase when removing or replacing the strainer. Therefore, maintenance work for the strainer is not only dramatically simplified compared to the conventional method by arranging the strainer in the middle of the crankcase, but also the ease of assembling the strainer can be improved.

The present invention has many advantages as mentioned above.

[Brief explanation of the drawing]

Figure 1 is a side view of the motorcycle, Figure 2 is a side view of the engine with main parts broken away, and Figure 3 is a side view of the engine.
4 is an explanatory longitudinal sectional front view of the lower part of the crankcase, FIG. 4 is an external side view of one crankcase half showing essential parts, and FIG. 5 is a sectional view taken along the line 5-5 in FIG. In the drawing, 30 is a crankcase, 327 is a locking portion, 19 is a cover, and 20 is an oil strainer.

Claims (1)

[Scope of utility model registration request] The oil strainer mounting structure for an internal combustion engine includes a crankcase having an integrally formed crankcase bottom constituting the oil pan, and a crankcase cover is removably fastened to the side surface of the crankcase. An oil strainer mounting part is provided at or near the center of the bottom of the crankcase, and the oil strainer is fixed to the mounting part on the bottom of the crankcase via a locking member that is detachable from the crankcase cover side. An oil strainer mounting structure for an internal combustion engine characterized by the following features: