JPS6337459Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention was published in Utility Application No. 56-121188
11303), and more specifically, it relates to an oil separator structure for an engine that can prevent oil from flowing into the oil separator.

[Conventional technology]

In recent years, a crescent-type oil pump that has a drive gear fitted externally on the crankshaft and a driven gear that houses the drive gear, as disclosed in Utility Model Application Publication No. 54-8701, has recently been used as an engine oil pump. It is becoming widely used.

When using such an oil pump,
As shown in Figs. 3 and 4, the present inventor proposed a system in which the oil pump P is integrally formed with the oil seal retainer c attached to the front end surface of the cylinder block a, as shown in the specification of Utility Model Application No. 56-121188 and It is proposed by drawings (published as Utility Model Application Publication No. 58-25606 after the filing of the present application and published as Utility Model Publication No. 62-11303). By providing the oil pump p in the oil seal retainer c in this way, the space d between the cylinder block a and the oil seal retainer c, which is a dead space that is normally left unused, can be utilized to downsize the engine. Although the aim is to reduce the weight, the above publication further states that the space d
In addition, by providing an oil separator e that separates oil mist in the blow-by gas integrally with the oil seal retainer c, the oil separator e is provided integrally with the oil seal retainer c, compared to the conventional cylinder head cover or cylinder block, etc., in which the oil separator is separately installed. discloses an oil separator structure that can further reduce the size and weight of engines and reduce costs.

[The problem that the idea attempts to solve]

However, as a result of various studies carried out by the present inventor in implementing the above-mentioned publication, he found that if oil separator e is not provided with oil-shielding measures, oil leaking from oil pump p will leak between the pump cover and the crankshaft. It has been found that a part of the oil ejected from the gap h scatters toward the oil separator e and flows into the inlet end of the oil separator e, thereby reducing the oil separation efficiency of the separator e.

This is the drive gear G1 of oil pump p.
Although the cylinder block a side of the driven gear G2 inscribed in the drive gear G1 is shielded by a pump cover, the gear G2 is
1. After passing through the horizontal gap provided for smooth rotation of G2, the oil on the discharge side, whose pressure is normally regulated to about 4 km/cm ² , is discharged from the gap h, and the pump cover and the crankshaft stage. The bearing part k of the cylinder block a, which is located close to the attached part and further to the pump cover.
As shown by the dashed line in FIG. 4, a laminar jet flow m is ejected around the entire circumference of the gap between the two.

On the other hand, in the above-mentioned publication, the inlet end of the oil separator e was formed by a vertically hanging rib located on the oil separator e side and a rib n extending diagonally upward. As a result, the rib n extending diagonally upward forms an oil sump portion at the inlet end where oil is stored on its upper surface, and the oil in the oil sump portion flows into the oil separator e as blow-by gas is discharged. A large amount of oil is inhaled into the oil separator e, resulting in insufficient oil separation in the oil separator e, causing a large amount of oil to flow into the intake system, damaging the air cleaner element, wasting oil due to oil combustion, and causing engine air pollution. It has been found that problems arise, such as inhibiting the fuel ratio, leading to deterioration of fuel efficiency and engine combustion efficiency.

The present invention is based on the above-mentioned Japanese Utility Model Application No. 121188/1988 and the drawings (Japanese Utility Model Publication No. 11303/1983), in which an oil pump is provided in an oil seal retainer and a space between the oil seal retainer and the cylinder block is provided. The object of the present invention is to provide an oil separator structure (hereinafter referred to as structure) for an engine that can prevent oil from flowing into the oil separator.

[Means to solve the problem]

In order to achieve the above object, in the structure of the present invention, an oil pump having a drive gear externally fitted on the crankshaft and an oil separator are installed in the space formed by the cylinder block and the oil seal retainer attached to the front end surface of the cylinder block. are arranged side by side, and the oil separator includes a ventilation passage formed using a plurality of ribs that extend integrally from at least one of the cylinder block and the oil seal retainer, and the ventilation passage is arranged between the plurality of ribs. A rib located on the oil pump side hangs vertically from the upper surface of the space and has its lower end cut off below the space, and a rib adjacent to the rib extends upward from below the space beyond the lower end of the rib on the oil pump side. The rising rib extends upward from the inlet end of the air passage opening into the space at the lower end of the rib on the oil pump side, and defines a downstream part of the air passage through which oil scattered to the inlet end flows down. is forming.

[Effect]

Since the oil pump and oil separator are installed side by side in the space between the cylinder block and the oil seal retainer, which is usually a dead space, the engine can be made smaller and lighter. Further, since the oil separator is formed using a rib that is integral with at least one of the cylinder block and the oil seal, the use of separate members is eliminated, and the structure can be simplified and costs can be reduced.
The oil separator has a vertical rib that is located on the oil pump side and whose lower end is interrupted above the space so that the lower end forms the entrance end of the air passage, and a rib that is adjacent to the rib and rises from the lower surface of the space. It forms a downstream part of a ventilation passage extending from the inlet end.

Therefore, there is no oil sump at the inlet end, and the flow section allows the oil scattered from the oil pump to the inlet end to flow down under its own weight, suppressing the oil from flowing into the oil separator, and increasing the oil separation efficiency by the oil separator.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

1 and 2, the structure of the present invention shows a cylinder block 3 of an engine, and the cylinder block 3.
An oil pump P and an oil separator 7 are provided side by side in a space 5 formed between the oil seal retainer 4 attached to the front end surface of the oil seal retainer 4. Moreover, the vertical rib 70a and the rib 70b adjacent to this rib form the downstream part 1 having an inlet end.
0 prevents the formation of an oil stagnation at the inlet end and prevents oil from flowing into the oil separator 7.

The cylinder block 3 has a body 16 in which cylinders 15 on which pistons slide are arranged side by side, and a crankcase 17 that spreads out like a skirt is installed below, and an alternator, for example, is attached to the back side of one wall of the crankcase 17. A rectangular extension 19 is provided to protrude and form the oil separator 7 on the inner surface. Further, a flange portion 21 to which an oil pan 20 is attached is formed at the lower part. A mounting seat 2 along the crankcase 17 is provided on the front end surface of the cylinder block 3.
3 and by vertically disposing an inner wall 24 at a position away from the mounting seat 23, a recess 25 is formed inside the mounting seat 23. In addition, on the inner wall 24,
A semicircular boss portion 27 is provided, and the boss portion 27 cooperates with a main bearing cap 29 attached to the lower surface of the boss portion 27 to form a bearing portion 30 that can pivotally support the tip of the crankshaft 11. Further, the mounting seat 23 is provided with an oil supply port 32 communicating into the cylinder block 3 and a plurality of bolt holes.

The oil seal retainer 4 has a mounting seat 33 on its inner end face that is flush with the mounting seat 23, and has a recess 36 formed inside the mounting seat 33, and also has a seal 39 attached to the boss. crankshaft 11
Seal the shaft. On the other hand, the oil seal retainer 4 is also formed with an extension part 38 having the same shape as the extension part 19. Note that the oil seal retainer 4 forms an outer wall portion of the cylinder block 3.

Therefore, by bringing the mounting seats 23 and 33 of the oil seal retainer 4 and the cylinder block 3 into contact and connecting them with bolts, the recesses 25 and 36 are formed between them.
The space 5 is formed by:

The oil pump P includes a drive gear 45 that is inserted into a pump hole 43 recessed in the inner surface of the oil seal retainer 4 and fits into the notch 11a of the crankshaft 11, and an eccentric drive gear 45 that is inscribed in the drive gear 45. The pump is a so-called crescent type pump that houses a driven gear 46, and the drive gear 45 and driven gear 46 are shielded by a pump cover 50 having a hole 49 into which the crankshaft 11 is loosely inserted.

The pump cover 50 and the bearing portion 30 are close to each other, and the pump cover 50 has an interrupted portion 55 in a direction different from the oil separator 7 on the surface 9a facing the cylinder block 3, and a sealing material 53.
A protrusion 54 is provided with a concave groove 52 into which the ridge is inserted. This sealing material 53 is applied to the facing surface 9 of the bearing portion 30.
By making contact with b, the oil ejected from the oil pump P through the hole 49 can flow out from the interrupted portion 55. The oil pump P is formed with a conduit portion 59 that communicates with a hole 57 that is aligned with the oil filler port 32 of the cylinder block 3, and the conduit portion 59 has a relief valve 6.
0 branches, and a suction pipe 62 having a strainer 61 at its lower end is attached to the lower surface of the oil pump P. Note that a protrusion 66 provided on the pump cover 50 extends in front of the relief hole 64 of the relief valve 60, and the oil discharged from the relief hole 64 is caused to flow downward by the protrusion 66, thereby preventing the oil from scattering. prevent.

In this example, the oil separator 7 has a space 5
It is formed using the extension parts 19, 38 which are part of the.

The oil separator 7 is integrated with the oil seal retainer 4 and the cylinder block 3, and in this example, the ribs 70a, 70b, 70c, and 70d that are connected in series are protruded upward and downward in order alternately. By providing this, a ventilation path 76 that meanders up and down is formed. Mata rib 7
Among 0a to 70d, rib 70a is oil pump P
The extension part 1 located on the side and forming the upper surface of the space 5
It hangs down vertically via an inwardly projecting portion from the bolt hole seat 9, and its lower end is interrupted below the space 5. Also, the rib 7 adjacent to this rib 70a
0b rises upwardly through a projecting portion extending inward from the bolt hole seat of the extension portion 19 below the space 5, and furthermore, rises above the lower end of the rib 70a and ends below the upper surface of the space 5. . Therefore,
The lower end of the rib 70a forms an inlet end 8 of the ventilation passage 76, which opens in the space 5, between the rib 70a and the rib 70b. Therefore, the occurrence of oil stagnation as in the above-mentioned publication is eliminated. Also vertical rib 70
A and the upwardly rising rib 70b form a flow section 10 extending upward from the inlet end 8 at the lower end. Further, the flow section 10 causes the oil scattered from the pump P to the inlet end 8 to flow down by its own weight, and prevents the oil from flowing into the oil separator 7 . Note that the bases of the ribs 70b, 70d rising from below are provided with cutouts 79 for oil spillage, and the cutouts 79 allow the separated oil remaining in the ribs 70b, 70d to be discharged into the space 5. sell.

Note that the lengths of the ribs 70a and 70b can be freely set as long as the oil from the oil pump P can flow downward.

Therefore, by driving the crankshaft 11, the oil pump P supplies oil from the suction pipe 62 to the oil supply port 32.
to lubricate the engine and also lubricate the hole 49.
Most of the leaked oil is injected from the discontinuous portion 55 of the protrusion 54. Also, the oil separator 7 is
While the blow-by gas is turned up and down in the ventilation passage 76, the oil is sequentially separated, coagulated, and settled, and the oil is sent to the outlet 80.
On the other hand, the oil separator 7
Since the rib 70a on the oil pump P side hangs vertically from the upper surface of the space 5, and there is no oil sump at the inlet end 8, there is no accumulation of oil at the inlet end 8. , blocks the oil that scatters through the gap between the bearing part 30 and reduces the oil flowing into the oil separator 7, while causing the oil to flow down by its own weight through the flow part 10, thereby preventing the oil from flowing into the oil separator 7. prevent. Therefore, oil is not sucked up into the air passage 76, which prevents wastage of oil, prevents oil loss in the air cleaner element in the intake system, and allows accurate adjustment of the air-fuel ratio to reduce engine fuel consumption. It can be reduced.

[Effect of idea]

As mentioned above, the oil pump and separator are installed side by side in the space between the cylinder block and oil seal retainer, which helps make the engine smaller and lighter. Furthermore, the oil separator is formed using ribs that are integral with the cylinder block and oil seal retainer, which can simplify the structure. Further, a rib facing the oil pump hangs vertically from the upper surface of the space, and a rib adjacent to this rib extends upward from the bottom of the space and beyond the lower end of the rib. Therefore, at the lower end of the rib on the oil pump side, at the inlet end of the air passage of the oil separator, an oil sump unlike that in the above-mentioned Japanese Utility Model Publication No. 62-11303 is not formed, thereby preventing oil from being sucked in. Furthermore, the space between the ribs forms a flow section, and the oil splashed at the inlet end flows down due to its own weight within the flow section, thereby preventing it from flowing into the oil separator. As a result, oil suction by the oil separator can be significantly reduced, improving the separation efficiency of oil mist in blow-by gas, preventing oil from flowing into the intake system, and reducing its waste. It has excellent effects, such as preventing dirt from forming and improving fuel efficiency.

The structure of the present invention can be modified in various ways, such as by extending the rib from either the oil seal retainer or the cylinder block.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is an exploded perspective view, and Figures 3 and 4 are perspective cross-sectional views illustrating the conventional structure. 3... Cylinder block, 4... Oil seal retainer, 5... Space, 7... Oil separator, 8... Inlet end, 10... Downstream section, 45... Drive gear, 46... Driven gear, 70a-7
0d...Rib, 76...Air passage, 80...Outlet, P...Oil pump.

Claims (1)

[Scope of utility model registration request] An oil pump having a drive gear externally fitted onto the crankshaft and an oil separator are provided side by side in a space formed by a cylinder block and an oil seal retainer attached to the front end surface of the cylinder block. The air passage includes a plurality of ribs integrally extending from at least one of the block and the oil seal retainer, and the air passage includes one of the plurality of ribs.
A rib located on the oil pump side that hangs down vertically from the upper surface of the space and whose lower end ends below the space, and a rib that is adjacent to this rib and extends upward from below the space beyond the lower end of the rib on the oil pump side. The raised ribs form, between them, a downstream part of a ventilation passage that extends upward from the inlet end of the ventilation passage that opens into the space at the lower end of the rib on the oil pump side, and that causes oil scattered to the inlet end to flow down. Engine oil separator structure.