JPS6212809Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The invention makes it possible to control the generation of oil mist within the crankcase by providing a guide wall that faces the oil relief hole of the relief valve with a gap in between. This invention relates to an oil scattering prevention device for an engine.

[Background technology]

Conventionally, a relief valve for adjusting oil pressure in a lubrication system of an engine has an oil relief hole (a) connected to the suction side (b) of an oil pump, as shown in FIG. 5, for example.
Either the oil that becomes excessive as the engine speed increases is recirculated from the oil relief hole a to the suction side b, or the oil relief hole is opened in the crankcase and the oil is freely injected into the case. It is formed. However, the former type has drawbacks such as the fact that the oil pump itself tends to be large and cannot be used as an oil pump installed in a narrow space. Although the latter type has a simpler configuration, the oil pressure of the oil pump is usually 3.5 to 6 kg/cm ²
As the engine speed increases, oil will be vigorously jetted out from the oil relief hole and will be dispersed into the crankcase in the form of mist. On the other hand, the oil mist generated in the crankcase due to the rotation of the cooking stove etc. is separated from the blowby gas by an oil separator formed in the blowby gas passage, but the oil mist sprayed and diffused into the crankcase from the oil relief hole is As a result, the burden on the oil separator increases, resulting in an increase in its size, lowering the separation efficiency, and at the same time causing oil deterioration due to increased contact with blow-by gas.

[Purpose of invention]

In this invention, an oil pump and a relief valve having a relief hole are arranged side by side, and a guide wall facing the oil relief hole is formed on the oil pump cover by extending a part of the oil cover. Engine oil that can suppress the generation of oil mist in the engine and reduce contact with blow-by gas to prevent oil deterioration and solve the above problems, and can also increase the rigidity of guide walls and reduce engine vibration and noise. The purpose is to provide a scattering prevention device.

[Disclosure of invention]

The engine oil scattering prevention device 1 of the present invention includes:
An oil pump cover 20 that covers the oil pump 2 and provides the oil pump 2 of the engine and a relief valve 13 for oil pressure adjustment that communicates with the oil pump 2 and has an oil relief hole 19 side by side.
The oil pump cover 20 is provided with a guide wall 22 that faces the oil relief hole 19 with a gap g therebetween and causes oil ejected from the oil relief hole 19 to collide with the guide wall 22.
The oil pump cover 2 is formed by extending a part of the oil pump cover 2 so that the oil ejected from the oil relief hole 19 can collide with the guide wall 22 and flow down into the oil pan without being diffused.
Since the guide wall 22 is extended at 0, its rigidity is increased and the vibration of the guide wall 22 itself due to the oil injection pressure can be reduced.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in which an engine oil pump 2 is installed in an oil seal retainer 5 that is attached to the front surface of a cylinder block 3 and can seal the tip of a crankshaft 4. Taking as an example a case where an oil bun 6 is provided on the lower surface of the retainer 5, one embodiment thereof will be described below based on the drawings.

In the figure, the oil pump 2 is formed using a well-known structure, for example, an internal gear type pump, and its drive member 7 is fixedly attached to the crankshaft 4.
A suction pipe 9 having a strainer 8 close to the bottom plate of the oil bun 6 is provided at the lower end of the oil pump 2. The oil pump 2 has an oil outlet 10 formed in the wall of the oil seal retainer 5.
A branch pipe part 14 is formed in the pipe part 11, which communicates with the pipe part 11 through a guide hole 12, and in which the relief valve 13 is housed. Note that the pipe portion 11 and the branch pipe portion 14 are integrally formed in the oil seal retainer 5. The relief valve 13 has a cap shape and is housed in a stepped hole 15 provided in the branch pipe portion 13.
Therefore, the oil pump 2 and the relief valve 13 are provided side by side. The stepped hole 15 communicates with the guide hole 12, and the relief valve 13 is biased upward by a spring 17 held at one end by a retaining ring 16 to normally close the stepped hole 15. Further, an oil relief hole 19 is formed in the stepped hole 15, and the hole 19 opens and communicates with the guide hole 12 when the relief valve 13 is lowered against the spring 17 as the oil pressure increases.

Further, an oil pump cover 20 that covers the oil pump 2 is fixed to the retainer 5 by bolts. The oil pump cover 20 has an extension piece 21 extending with a part thereof directed toward the oil relief hole 19, and a gap g of about 15 mm or less, preferably about 5 mm, between the extension piece 21 and the oil relief hole 19. and is formed integrally with the oil pump cover 20. Therefore, the extension piece 21 forms the guide wall 22 that causes the oil ejected from the oil relief hole 19 to collide with the guide wall 22 to prevent the oil from spreading.

In addition, 24a, 24b, 25a, 25b in the figure,
Reference numerals 26a and 26b are ribs formed on the oil seal retainer 5 and the cylinder block 3, both of which are arranged in symmetrical positions, and by combining the two, an oil separator 27 having a labyrinth inside is formed.
can be formed, ribs 24a, 24b, 25a, 25
The blow-by gas can enter from between the cylinder block 3 and the cylinder block 3 to separate the oil mist passing through the labyrinth, and the blow-by gas can be discharged from the discharge port 29 provided in the cylinder block 3 to, for example, the intake system.

However, in the device 1 of this embodiment, the pressure becomes high due to the increase in engine speed, and the oil jetted out from the oil relief hole 19 collides with the guide wall 22 and flows into the oil bun 6 below. can prevent the spread of Therefore, the amount of oil mist floating in the crankcase can be reduced,
It is possible to drain the oil easily, thereby enabling efficient oil separation in the oil separator 27, and it is also possible to reduce the capacity of the oil separator. Furthermore, contact with blow-by gas due to oil diffusion can be suppressed, and deterioration of the oil can be prevented. Further, the guide wall 22 is an extension piece 2 of the oil pump cover 20.
1, it is possible to increase the rigidity by freely selecting the thickness compared to the case where it is installed separately, and the vibration caused by collision with the oil spouted from the oil relief hole 19 can be reduced. It can be significantly reduced.

[Effect of idea]

As mentioned above, the device of the present invention is provided with a guide wall facing the oil relief hole of the relief valve with a gap in between, so that the oil jetted from the oil relief hole is immediately allowed to flow down into the oil van without being diffused. As a result, the amount of oil mist scattered into the crankcase is reduced, eliminating oil deterioration due to mixing with blow-by gas, and at the same time, it is easier to drain the oil before blow-by gas is discharged, and the capacity of the oil separator can be reduced. Helps make the engine more compact. In addition, since the oil pump and the relief valve are arranged side by side, and a part of the oil pump cover that covers the oil pump is extended to form a guide wall, the rigidity is higher than when the guide wall is provided separately, and the thickness can be selected more freely. In addition to the increased vibration, it is possible to significantly reduce the vibration caused by collision with oil, which can reduce engine vibration and noise.In addition to making it easier to install guide walls, the structure is simpler and cheaper. It can produce excellent effects such as production.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view illustrating a cylinder block and an oil seal retainer, Fig. 2 is a cross-sectional view showing an embodiment of the present invention, Fig. 3 is an exploded perspective view thereof, and Fig. 4 is a schematic diagram showing a conventional device. FIG. 2... Oil pump, 3... Cylinder block, 4... Crankshaft, 5... Oil seal retainer, 6... Oil van, 13... Relief valve,
19... Oil relief hole, 20... Oil pump cover, 21... Extension piece, 22... Guide wall, g...
…gap.

Claims (1)

[Scope of utility model registration request] An oil pump of the engine and a relief valve for adjusting hydraulic pressure which communicates with the oil pump and has an oil relief hole are provided side by side, and an oil pump cover that covers the oil pump faces the oil relief hole with a gap therebetween. An oil scattering prevention device for an engine, characterized in that a guide wall against which oil ejected from an oil escape hole collides is formed by extending a portion of the oil pump cover.