JPS6337448Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention aims at downsizing the engine by installing an oil pump and an oil separator in the dead space between the cylinder block and the oil retainer. , relates to an oil-shielding structure for an oil separator that can prevent oil from flowing into the oil separator.

[Conventional technology]

In recent years, with the aim of reducing the size and weight of engines, crescent-shaped oil pumps having a drive gear externally fitted onto a crankshaft and a driven gear internally surrounding the drive gear have been increasingly used.

When using such an oil pump,
The inventor of the present invention proposed a system in which the oil pump p is integrally formed with an oil seal retainer c attached to the front end surface of a cylinder block a, as shown in FIGS. 56-121188. The invention is proposed in the following documents and drawings (published after the filing of the present application in Japanese Utility Model Publication No. 58-25606 and published as Publication of 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 idle, can be utilized, making the engine smaller and lighter. However, this practice can promote the effects of
Publication No. 11303 (hereinafter referred to as the publication) further provides an oil separator e for separating oil mist in the blow-by gas in the space d, which is integrated with the oil seal retainer c. The present invention discloses an oil separator that can be useful for downsizing and cost reduction of an engine compared to an oil separator that is separately installed in a block.

[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 proposal, he found that if no oil-blocking measures are taken to prevent oil from entering the oil separator e, the oil leaking from the oil pump P will It has been found that a part of the oil ejects from the gap h between the pump P and the crankshaft and scatters toward the oil separator e, degrading the oil separation efficiency of the oil separator e.

This is the drive gear G1 of the oil pump P.
The driven gear G2 that inscribes the drive gear G1 has its cylinder block a side shielded by the inner wall of the oil pump P when the pump cover and the pump cover are provided on the outside. , passing through the horizontal clearance provided for smooth rotation of G2, on the discharge side, usually 4 Km/cm ²
The oil whose pressure is regulated to a certain level is discharged from the gap h, and this oil is pumped to the oil pump P, to the stepped part of the crankshaft, and further to the bearing part k of the cylinder block a.
As shown by the dashed line in FIG. 4, a laminar jet flow m is ejected over almost the entire circumference into the gap between the two. Therefore, when an oil sump is formed, for example by providing a rib n extending diagonally upward at the inlet end of the oil separator e, as in the above-mentioned publication, the spouted oil is stored in the oil sump. In addition, a large amount of oil is sucked into the oil separator e as the blow-by gas is discharged, resulting in insufficient oil separation in the oil separator e. As a result, a large amount of oil flows into the intake system, damaging the air cleaner element and wasting oil by burning the oil.It also impedes the air-fuel ratio of the engine, resulting in a decrease in fuel efficiency and engine combustion efficiency. Problems such as invitations arise.

The present invention provides an oil pump in an oil seal retainer, an oil separator in the space between the oil seal retainer and the cylinder block, and an oil shielding member on the side of the oil separator of the oil pump facing the suction port. Therefore, the purpose of this paper is to propose an oil-shielding structure (hereinafter referred to as structure) for an engine oil separator that can prevent oil mist from being mixed into intake system gas.

[Means to solve the problem]

In order to achieve the above object, in the structure of the present invention, an oil separator 7 and a crankshaft are provided in the space 5 formed by the cylinder block 3 and the oil seal retainer 4 attached to the front end surface thereof. An oil pump P having a drive gear 45 externally fitted onto the shaft 11 is installed side by side, and the pump cover 5 is installed at least on the side facing the suction port 77 of the oil separator 7.
0 and the surface 9 facing the cylinder block 3
An oil blocking member 13 is provided which blocks oil leaking from the gap between the oil pump P and the crankshaft 11 by straddling the gap between the oil pump P and the crankshaft 11.

[Effect]

Oil leaking from the gap between the oil pump P and the crankshaft 11 as the crankshaft rotates is prevented from entering the oil separator 7 by an oil blocking member 13 on the side facing the suction port 77 of the oil separator 7. , it is possible to prevent the oil from being mixed into the gas of the intake system.

Further, by arranging the oil pump P and the oil separator 7 side by side in the space 5 between the cylinder block 3 and the oil seal retainer 4, the engine can be made smaller.

〔Example〕

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

1 and 2, the structure of the present invention consists of a space 5 formed between an engine cylinder block 3 and an oil seal retainer 4 attached to its front end surface.
An oil pump P and an oil separator 7 are installed side by side, and an oil shielding member 13 is provided on the side of the oil separator 7 facing the suction port 77, spanning between the facing surfaces of the oil pump P and the cylinder block 3. It is set up.

The cylinder block 3 includes 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 provided below, and an alternator, for example, can be attached to one wall of the crankcase 17. , a rectangular extension 19 extending laterally and forming an oil separator 7 therein.
At the same time, a flange portion 21 to which an oil pan 20 is attached is formed at the lower part. A mounting seat 23 is formed on the front end surface of the cylinder block 3 and extends to the front edge of the crankcase 17.
By vertically installing an inner wall 24 at a position away from 3, a recess 25 is formed inside the mounting seat 23.
Note that a semicircular boss portion 27 is provided on the inner wall 24,
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 and is provided with an oil groove 3a. The mounting seat 23 is provided with an oil filler port 32 communicating into the cylinder block 3 and a plurality of bolt holes.

The oil seal retainer 4 has a mounting seat 23 at its inner end that is flush with the mounting seat 23, and has a recess 36 formed therein, and also has a seal 39 attached to the boss. While the crankshaft 11 is sealed, 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 oil seal retainer 4 into contact with the mounting seats 23, 33 of the cylinder block 3 and connecting them with bolts, the oil seal retainer 4
A space 5 consisting of recesses 25 and 36 is formed between the crankcase 17 and the crankcase 17.

The oil separator 7 is formed between extensions 19 and 38 that are part of the space 5.

The oil separator 7 forms a vertically meandering ventilation passage 76 by providing ribs 70 approximately vertically and alternately between the inner wall 24 of the cylinder block 3 and the oil seal retainer 4. A suction port 77 communicating with the space 5 is provided at one end, and a discharge port 79 passing through the wall of the cylinder block 3 is provided at the other end of the air passage 76.

The oil pump P includes a drive gear 45 that is inserted into a pump hole 43 recessed in the back surface of the oil seal retainer 4 and fits into the notch 11a of the crankshaft 11, and an eccentric driven gear that inscribes the drive gear 45. 46, and the drive gear 45 and driven gear 46 are connected to the pump cover 5.
occluded by 0.

The pump cover 50 and the bearing section 30 are relatively close to each other, and their facing surfaces 9
An oil shielding member 13 is provided between a and 9b. In this embodiment, the oil shielding member 13 consists of a groove 52 formed on one surface 9a of the pump cover 50 facing the other, and a sealing material 53 that fits into the groove 52 and comes into contact with the other surface 9b facing the pump cover 50. , the groove 52 is formed on the protrusion 54 formed around the hole 49 and at a shallower bottom than the height of the protrusion 54 . In addition, the protrusion 54 has
A discontinuous portion 55 is provided on the opposite side of the oil separator 7 from the suction port 77 and at a position facing diagonally downward.
Equipped with. Further, the sealing material 53 is made of a seal ring that is cut out by the length of the interrupted portion 55, and by aligning and attaching the removed portion 53a of the sealing portion 53 to the interrupted portion 55, the hole 49 can be closed. An oil escape port 12 is formed to discharge high-pressure, high-temperature oil leaking between the engine and the crankshaft 11 in a direction different from that of the oil separator 7. Therefore, oil shielding member 1
3 is provided on the side of the oil separator 7 facing the suction port 77 between the opposing surfaces 9a and 9b of the pump cover 50 and the cylinder block 3.

The oil pump P includes a conduit portion 59 communicating with a hole 57 that coincides with the oil filler port 32, and a relief valve 60 branches into the conduit portion 59. A strainer 61 is installed at the lower end of the lower surface of the oil pump P. A suction pipe 62 is attached. Moreover, the relief valve 6
The pump cover 50 is inserted into the relief hole 64 of 0.
A projecting piece 66 provided in the relief hole 64 is extended in front of the relief hole 64, and the oil discharged from the relief hole 64 is caused to flow downward by the projecting piece 66, thereby preventing the oil from scattering.

The structure of the present invention is not limited to that of the embodiment, and may include a structure in which an O-ring is attached to the groove 52 in the range where the oil shielding member 13 faces the suction port 77 of the oil separator 7, or a structure in which the groove 52 is attached to a cylinder block. 3
An oil shielding member 13 formed on the bearing side, or a rubber plate or the like only near the oil separator 7.
or in which the oil shielding member 13 made of rubber or the like is directly bonded to the pump cover 50 by adhesion, baking, etc., or in which a recess is formed in the pump cover 50 without using a sealing material such as rubber.
Various modifications are possible, such as forming a convex part on the bearing part 30 of the cylinder block 3 and engaging the two parts.

[Effect of idea]

In this way, the structure of the present invention has an oil shielding member that spans between the opposing surfaces of the pump cover and cylinder block on the side facing the oil separator's suction port, which prevents oil from leaking from the gap between the oil pump and the crankshaft. Oil can be prevented from entering the oil separator. Therefore, it is possible to prevent oil from entering the gas in the intake system, thereby preventing oil wastage, preventing oil loss in the air cleaner element in the intake system, and accurately adjusting the air-fuel ratio to reduce engine fuel consumption. It is possible to reduce the Furthermore, since the oil separator and oil pump are installed side by side in the space formed by the cylinder block and oil seal retainer, it is possible to downsize the engine, and in cooperation with the oil shielding member, high combustion efficiency can be maintained.

[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, 9a, 9b... Surface, 11... Crank shaft,
13... Oil shielding member, 45... Drive gear, 46
...Driven gear, 77...Suction port, P...Oil pump.

Claims (1)

[Scope of utility model registration request] In the space formed by the cylinder block and the oil seal retainer attached to its front end surface, an oil separator and an oil pump equipped with a drive gear installed in the oil seal retainer and externally fitted on the crankshaft are installed side by side. On the other hand, at least on the side facing the suction port of the oil separator,
An oil separator for an engine, comprising an oil shielding member that blocks oil leaking through a gap between the oil pump and the crankshaft by straddling the opposing surfaces of the oil pump and the cylinder block. Oil-shielding structure.