JPH112111A - Engine lubrication structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine lubrication structure capable of dipping up sufficient lubrication oil even when the engine is tilted in a great degree. SOLUTION: This engine lubrication structure, which accomplishes lubrication by dipping up and dispersing lubrication A in a crankcase 23 with an oil dipper 26a provided on a connecting rod 26, is provided with a plural number of oil dippers 26a so that they can dip up lubrication A even if the position of the lubrication A in the crankcase 23 changes due to tilting of the engine 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication structure for an engine of a splash type lubrication system.

[0002]

2. Description of the Related Art The lubricating structure of this type of engine includes:
There is known an oil scraper for scraping lubricating oil provided on a connecting rod.

[0003]

However, in the conventional engine lubrication structure, only one oil scraper is provided on the connecting rod, so that when the engine is tilted, the oil is scraped by the oil scraper. There is a risk that it cannot be raised. In particular, when the engine is used as a portable power source, the engine is greatly tilted, so that insufficient lubrication may cause poor lubrication.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a lubricating structure for an engine that can sufficiently lubricate the lubricating oil even when the engine is greatly inclined.

[0005]

Means for Solving the Problems To solve the above problems, the invention according to claim 1 is based on a connecting rod (2).
6) An engine lubricating structure for lubricating by lubricating the lubricating oil (A) in the crankcase (23) by means of an oil scraper (26a) provided in 6).
Even if the position of the lubricating oil (A) in the crankcase (23) changes due to the inclination of the engine (20), the lubricating oil (26a) can lift the lubricating oil (A). In addition, a plurality of the oil scrapers (26a) are provided.

According to a second aspect of the present invention, in the first aspect of the present invention, the lubricating oil storing portion (23a) in the crankcase (23) is provided with respect to the output rotary shaft (25a) of the crankshaft (25). It is characterized by being formed concentrically.

[0007] The first aspect of the present invention is configured as described above.
In the invention according to the first aspect, even if the lubricating oil (A) moves by tilting the engine (20), the plurality of oil scrapers (2) are removed.
The lubricating oil (A) can be scraped by any one of 6a). Therefore, even when the engine (20) is used as a portable power source, insufficient lubrication can be prevented.

According to the second aspect of the present invention, the lubricating oil reservoir (23a) in the crankcase (23) is formed concentrically with respect to the output rotation shaft (25a) of the crankshaft (25). Even if the position of the lubricating oil (A) moves due to the inclination of (20), the output rotation shaft (2)
The distance between 5a) and the liquid level of the lubricating oil (A) can be made substantially constant. Therefore, when the engine (20) is tilted, the liquid level of the lubricating oil (A) approaches the crankshaft (25), and, for example, the balance weight (25b) of the crankshaft (25) moves in the lubricating oil (A). Entering the lubricating oil (A) abnormally. Therefore, it is possible to prevent the rotation resistance of the crankshaft (25) from increasing and the temperature of the lubricating oil (A) from abnormally rising due to the inclination of the engine (20).

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. However,
1 to 4 show a first embodiment, FIG. 5 shows a second embodiment, and FIG. 6 shows a third embodiment.

First, a first embodiment will be described with reference to FIGS. In the engine lubrication structure shown in this embodiment, the engine 20 is a four-stroke engine as shown in FIG.
A cylinder head 22 disposed at the top of
1 and a crankcase 23 which is wider than the cylinder 21 and has a schematic configuration in appearance.

A piston 24 is slidably provided in the cylinder 21, and a crankshaft 25 is disposed in the crankcase 23. Crankshaft 2
Numeral 5 rotates around an output rotation shaft 25a, and a crank pin 25b provided at an eccentric position is connected to a piston 24 via a connecting rod 26.

The connecting rod 26 is provided with two oil wipers 26a at the lower end of the connecting rod 26. These oil scrapers 26a are provided at positions that are distributed at an angle of 45 degrees left and right with respect to the center line of the connecting rod 26. The trajectory L of the tip of each oil scraper 26a when the crankshaft 25 rotates is as shown in FIG.

That is, when the cylinder 21 is held vertically, as shown in FIG. 1, the liquid level A1 of the lubricating oil A is horizontal, and the trajectory L enters the lubricating oil A. Has become. Also, the cylinder 21 has 90
When inclined, the lubricating oil A moves to the position indicated by the liquid level A2. In this case, the trajectory L of one oil scraper 26a enters the lubricating oil A. Further, the cylinder 21
Is inclined 90 degrees to the other side, the lubricating oil A moves to the position indicated by the liquid level A3. In this case, the trajectory L of the other oil scraper 26a enters the lubricating oil A. Therefore, the two oil scrapers 26a are provided so that even if the engine 20 is tilted in the range of plus / minus 90 degrees and thereby the position of the lubricant oil A changes, the lubricant oil A can be sufficiently scraped. Have been.

In the crankcase 23, a portion passing through the center of the output rotary shaft 25a and below a line 23A in a direction perpendicular to the axis of the cylinder 21 is an oil pan (lubricating oil storing portion) 23a. I have. This oil pan 23a
Are formed concentrically with respect to the output rotation shaft 25a. That is, in the oil pan 23a, the distance between the liquid level A1 of the lubricating oil A and the output rotary shaft 25a is constant even when the engine 20 is tilted, and the crankshaft 25
For example, the balance weight 25b is not immersed in the lubricating oil A.

Further, the crankcase 23 of this embodiment
When the lubricating oil A moves beyond the oil pan 23a, for example, the engine 20 is moved to about 90 degrees as described above.
Is tilted, the liquid level A2 or the liquid level A3 and the output rotary shaft 2
The distance to 5a is constant.

On the other hand, in the first embodiment, the carburetor mounting structure has a characteristic feature. That is, the carburetor mounting structure is, as shown in FIGS.
The carburetor 2 is configured to be attached to the engine 20 via an insulator 11. The carburetor 2 is the other end face of the insulator 11 with respect to the attachment face S1 to the engine 20 which is one end face of the insulator 11. 2 has a predetermined angle K
It is characterized in that it is inclined.

The insulator 11 is fixed to the engine 20 by the insulator fixing screw 5 such that the mounting surface S1 is brought into close contact with the intake flange surface 22a of the cylinder head 22. The carburetor 2 is fixed to the insulator 1 by the carburetor fixing screw 6 such that the connection surface 2a is brought into close contact with the mounting surface S2 of the insulator 1.

The insulator fixing screw 5 extends perpendicular to the mounting surface S1, and the carburetor fixing screw B extends perpendicular to the mounting surface S2. The angle K is set so that the insulator fixing screw 5 can be inserted and removed without hitting the carburetor 2 or the air cleaner 7 when the carburetor 2 is mounted on the mounting surface S2.

In FIG. 4, reference numeral 11a denotes a through hole for passing the insulator fixing screw 5, and reference numeral 11b denotes a groove for fixing the carburetor fixing screw 6. Groove 11
As shown in FIG. 2, a nut 11c is embedded in insert b by insert molding, and a carburetor fixing screw 6 is screwed into the nut 11c. The cylinder head 22 is formed with a screw hole 22b into which the insulator fixing screw 5 is screwed so as to be orthogonal to the intake flange surface 22a. 3 and 4, reference numeral 11d denotes an intake passage.

In the lubricating structure for an engine configured as described above, even if the lubricating oil A moves due to the inclination of the engine 20, the lubricating oil A is scraped by at least one of the two oil scrapers 26a. Can be raised. Therefore, even when the engine 20 is used as a portable power source, insufficient lubrication can be prevented.

Since the oil pan 23a of the crankcase 23 is formed concentrically with respect to the output rotary shaft 25a, even if the engine 20 is tilted and the position of the lubricating oil A moves, the oil pan 23a is not lubricated with the output rotary shaft 25a. Oil A level A1, A
2. The distance from A3 can be made substantially constant. For this reason, when the engine 20 is tilted, for example, the balance weight 25b of the crankshaft 25 enters the lubricating oil A, abnormally agitates the lubricating oil A, and increases the rotational resistance of the crankshaft 25 or increases the lubricating oil. It is possible to prevent the temperature of A from abnormally increasing.

In the carburetor mounting structure configured as described above, since the mounting surface S1 and the mounting surface S2 of the insulator 11 are inclined at a predetermined angle K, the peripheral surface of the cylinder head 22 of the engine 20 is formed. Therefore, it is possible to prevent the carburetor 2 and the air cleaner 7 from projecting in the normal direction. Since the mounting surface S1 and the mounting surface S2 are inclined at a predetermined angle K,
The carburetor 2 and the air cleaner 7 can be arranged along the peripheral surface of the cylinder 21 in the engine 20. Moreover, in this embodiment, the carburetor 2 and the air cleaner 7 can be arranged in a concave portion formed by the outer peripheral surface of the cylinder 21 and the outer peripheral surface of the crankcase 23. Therefore, the air cleaner 7 and the carburetor 2
The entire engine including the engine can be made compact.

Further, since the mounting surface S1 and the mounting surface S2 are inclined at a predetermined angle K, the carburetor 2 and the air cleaner 7 can be arranged at a position where they do not hinder the insertion and removal of the insulator fixing screw 5. . Therefore, the insulator 11 can be removed from the engine 20 or attached to the engine 20 while the carburetor 2 and the air cleaner 7 are attached to the insulator 11. That is, the maintainability can be improved.

Next, a second embodiment of the present invention will be described with reference to FIG. However, components common to those of the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be simplified. The second embodiment differs from the first embodiment in that a third oil remover 26a is provided at a central position between the two oil removers 26a shown in the first embodiment.

That is, the third oiler 26a is arranged on the center line of the connecting rod 26, and is arranged at a position inclined by 45 degrees with respect to the other two oiler 26a.

In the lubricating structure of the engine configured as described above, since the third oil wiper 26a is added on the center line of the connecting rod 26, the state in which the axis of the cylinder 21 is oriented vertically, that is, The scraping performance of the lubricating oil A when the engine 20 is not tilted can be improved. Therefore, even if the amount of the lubricating oil A decreases, sufficient lubrication performance can be maintained.

Next, a third embodiment of the present invention will be described with reference to FIG. However, the same elements as those of the second embodiment shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be simplified. The difference between the third embodiment and the second embodiment is that
A fourth and fifth oiler 26a is provided outside the three oiler 26a shown in the embodiment.

That is, the fourth and fifth oil removers 26
a is disposed in a direction orthogonal to the center line of the connecting rod 26, and is arranged with respect to the two oil scrapers 26a (the first and second oil scrapers 26a) shown in the first embodiment. Each is arranged at a position inclined by 45 degrees.

In the lubricating structure of the engine configured as described above, the fourth and fifth oil wipers 26a are added in a direction orthogonal to the center line of the connecting rod 26, so that the axis of the cylinder 21 is Is tilted in the plus / minus 90 direction with respect to the vertical direction,
Lubricating oil A can be sufficiently scraped. Therefore,
Even when the amount of the lubricating oil A decreases and the engine 20 is tilted, sufficient lubrication performance can be maintained.

In each of the above-described embodiments, the engine 20 is constructed so as to obtain a sufficient lubricating performance even in the range of plus / minus 90 degrees. It is preferable to use it in the range of 60 degrees. Therefore, the oil scraper 26a may be provided so that lubrication can be sufficiently performed in the range of plus / minus 45 degrees to 60 degrees.

[0031]

According to the first aspect of the present invention, even if the lubricating oil (A) moves due to the inclination of the engine (20), the lubricating oil (A) is moved by one of the plurality of oil scrapers (26a). (A) can be scraped up. Therefore, even when the engine (20) is used as a portable power source, insufficient lubrication can be prevented.

According to the second aspect of the present invention, the lubricating oil storing portion (23a) of the crankcase (23) is formed concentrically with the output rotation shaft (25a) of the crankshaft (25). Even if the position of the lubricating oil (A) moves due to the inclination of (20), the output rotation shaft (2)
The distance between 5a) and the liquid level of the lubricating oil (A) can be made substantially constant. Therefore, when the engine (20) is tilted, the liquid level of the lubricating oil (A) approaches the crankshaft (25), and, for example, the balance weight (25b) of the crankshaft (25) moves in the lubricating oil (A). Entering the lubricating oil (A) abnormally. Therefore, it is possible to prevent the rotation resistance of the crankshaft (25) from increasing and the temperature of the lubricating oil (A) from abnormally rising due to the inclination of the engine (20).

[Brief description of the drawings]

FIG. 1 is a sectional view of an engine lubrication structure shown as a first embodiment of the present invention.

FIG. 2 is a side view showing a carburetor mounting structure of the engine shown by the lubrication structure of the engine.

FIG. 3 is a view showing an insulator having the carburetor mounting structure, and is a view as seen from an arrow II in FIG. 2;

FIG. 4 is a perspective view showing an insulator having the carburetor mounting structure.

FIG. 5 is a sectional view of an engine lubrication structure shown as a second embodiment of the present invention.

FIG. 6 is a sectional view of an engine lubrication structure shown as a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 20 engine 23 crankcase 23a lubricating oil reservoir (oil pan) 25 crankshaft 25a output rotating shaft 26 connecting rod 26a oil scraper A lubricating oil

Claims (2)

[Claims] 1. A crankcase (2) provided by an oil wiper (26a) provided on a connecting rod (26).
3) A lubricating structure for an engine that lubricates by lubricating the lubricating oil (A) in the crankcase (23) by lubricating the lubricating oil (A) in the crankcase (23) by tilting the engine (20). A lubricating structure for an engine, wherein a plurality of the oil scrapers (26a) are provided so that the oil scrapers (26a) can scrape up the lubricating oil (A) even when the positions change. 2. A crankshaft according to claim 1, wherein the lubricating oil reservoir (23a) is formed concentrically with respect to the output rotation shaft (25a) of the crankshaft (25). 2. The lubricating structure of the engine according to 1.