JP2014206091A - Pressure control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure control device for preventing the pressure rise of the inside of a pipe, in which a blow-by gas flows, and the oil having leaked to the outside of the pipe from sticking to a high heat part.SOLUTION: A pressure control device comprises: pipes (31 and 32) communicating with a crankcase (12) and allowing a gas (or a blow-by gas) containing oil to flow therein; an oil reservoir (330) disposed in the pipe; and an oil exit (γ) formed on the radially outer side of the pipe. Said oil exit (γ) communicates with the oil reservoir (330). Said oil exit (γ) is disposed at a position apart from the crankcase (12) with respect to the oil reservoir (330) in the pipe longitudinal direction, that is, at a position for the oil to leak to the pipe outer side via the oil exist (γ), in the case where the pressure in the crankcase (12) becomes higher than a predetermined value.

Description

  The present invention relates to a pressure adjusting device that copes with an abnormal increase in pressure in a crankcase.

If any abnormalities or accidents occur and the engine crankcase pressure rises significantly, the engine lubricating oil breaks the seals in the blow-by gas treatment line and sprays to the outside. If it adheres to the hot part, it may lead to ignition.
In addition, there is a possibility that oil contained in blow-by gas enters the air intake path, induces abnormal combustion, and causes the vehicle to run away.
And the technique which can eliminate the problem mentioned above with a simple mechanism has not been proposed yet.

Other conventional techniques perform complicated valve opening / closing control (see Patent Document 1 and Patent Document 2).
However, in the related arts (Patent Document 1 and Patent Document 2), the oil pressure is increased in the crankcase and the oil seal portion provided in the pipe through which the blow-by gas flows is damaged, so that the oil flows out and the high heat portion (for example, exhaust gas) It does not prevent adhesion to the system or belt).

JP 2009-174334 A JP 2010-96029 A

  The present invention has been proposed in view of the above-described problems of the prior art, and the pressure inside the pipe through which the blow-by gas flows is increased, or the oil leaking out of the pipe is scattered and adheres to the high temperature part. The object is to provide a pressure regulating device to prevent.

The pressure adjusting device (3) according to the present invention is provided in pipes (31, 32) through which gas containing oil (blow-by gas) flows and communicates with the crankcase (12) and pipes (for example, pipe connection points). An oil reservoir (330) and an oil outlet (γ) formed radially outward of the pipe (31),
The oil outlet (γ) communicates with the oil reservoir (330), and the oil outlet (γ) is located away from the crankcase (12) with respect to the oil reservoir (330) in the longitudinal direction of the pipe. When the pressure in the crankcase (12) becomes higher than a predetermined value (threshold value), it is provided that the oil leaks to the outside of the pipe via the oil outlet (γ). It is a feature.

  In the pressure adjusting device (3) of the present invention, a region extending from the oil reservoir (330) to the oil outlet (γ) and extending to the oil outlet side has a region (virtual region) extended to the oil outlet side. It is preferable that a cover (34) is provided for covering.

  In the implementation of the present invention, it is preferable that the pressure adjusting device (3) is interposed upstream or downstream of a CCV filter (crankcase ventilation filter) interposed in a blow-by gas pipe.

According to the present invention having the above-described configuration, the oil contained in the gas flowing in the pipes (31, 32) flows while adhering to the inner wall of the pipe (31) and is stored in the oil reservoir (330). The At that time, the flow of blow-by gas is not hindered. The blow-by gas flowing through the pipe does not flow out of the pipe (31, 32) due to the oil stored in the oil reservoir (330).
And since the pressure regulating device (3) of the present invention is interposed in a pipe through which blow-by gas flows, when the pressure in the crankcase (12) or the pressure in the pipe is increased to a predetermined value (threshold) or more, The oil stored in the oil reservoir (330) by the pressure is pressed toward the oil outlet (γ) and flows out from the oil outlet (γ).
At this time, the region where the oil flows out is limited to a region in which the flow path connecting the oil outlet (γ) from the oil reservoir (330) is extended to the oil outlet (γ) side. ) From the oil outlet (γ) to the oil outlet side so that no high heat member such as an exhaust system or a belt is provided, the pressure inside the pipe (31, 32) is increased. Even if the oil flows out of the pipe (31, 32), it is prevented from coming into contact with the high heat member, and dangers such as ignition are prevented.

  Due to layout requirements, high-temperature members such as exhaust systems and belts must be placed in the region where the flow path communicating the oil outlet (γ) from the oil reservoir (330) extends to the oil outlet (γ) side. Even if it is a case, the area | region (virtual area | region) extended to the oil outlet side (gamma) to the area | region which extended the flow path which connects an oil outlet (gamma) from an oil reservoir part (330) to the oil outlet (gamma) side. If the cover (34) for covering is provided, the oil flowing out from the oil outlet (γ) is blocked by the cover (34), so that it does not contact the high heat member.

  Further, when the pressure in the crankcase (12) or the pressure in the pipes (31, 32) becomes higher than the threshold value, the oil flows through the oil outlet (γ) to the pipes (31, 32). Since it flows out to the outside, there is no possibility that the seal of the CCV filter is broken or the oil flows out from the broken portion of the seal.

  Furthermore, the present invention can be easily applied to an existing vehicle because an oil reservoir (330) and an oil outlet (γ) may be provided in pipes (31, 32) through which gas containing oil (blow-by gas) flows. It is possible to keep the additional construction cost low.

It is explanatory drawing which shows the layout at the time of attaching the pressure regulator which concerns on embodiment of this invention to an engine. It is sectional drawing of the pressure regulator which concerns on embodiment of this invention. It is the A section expanded sectional view in FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, the engine 1 includes a cylinder block 11, a crankcase 12, a cylinder head 13, a rocker cover 14, and an oil pan 15.
The engine 1 includes a blow-by gas processing line Lbg. The blow-by gas processing line Lbg includes a CCV filter (crankcase ventilation filter) 2, a pressure adjusting device 3 according to the embodiment, a first blow-by gas pipe 4, and the like. The second blow-by gas pipe 5, the third blow-by gas pipe 6, the fourth blow-by gas pipe 7, and the oil return hose 8 are provided.

The first blow-by gas pipe 4 communicates the rocker cover 14 and the CCV filter 2 and introduces (sucks) the blow-by gas in the rocker cover 14 into the CCV filter 2.
The second blow-by gas pipe 5 communicates the CCV filter 2 and the pressure adjusting device 3, and introduces oil and blow-by gas after gas-liquid separation by the CCV filter 2 into the pressure adjusting device 3.
The third blow-by gas pipe 6 communicates the CCV filter 2 and the intake duct 18, and introduces the gas that has been gas-liquid separated by the CCV filter 2 into the intake duct 18.
The fourth blow-by gas pipe 7 connects the pressure adjusting device 3 and the crankcase 12, and feeds oil and blow-by gas after gas-liquid separation by the CCV filter 2 into the crankcase 12.
In FIG. 1, reference numeral 16 indicates an intake manifold, and reference numeral 17 indicates an air cleaner.

Next, the pressure regulator 3 according to the illustrated embodiment will be described with reference to FIGS. 2 and 3.
In FIG. 2, the pressure adjusting device generally indicated by reference numeral 3 includes a first pipe 31, a second pipe 32, a first oil receiver 33, a cover member 34, and a second oil receiver 35. It is configured.

The first pipe 31 has a small diameter portion 311, a tapered portion 312, and a large diameter portion (expanded tube portion) 313, and the small diameter portion 311, the tapered portion 312 and the large diameter portion (expanded tube portion) 313 are integrally formed continuously. ing. For example, a steel pipe having a small diameter portion 311 as a material diameter can be plastically processed and integrally formed.
When the first pipe 31 is mounted on the engine 1, as shown in FIG. 2, the first pipe 31 is arranged so that the large diameter portion (expanded portion) 313 faces downward in the vertical direction.
The first pipe 31 is connected to the first blow-by gas pipe 4 shown in FIG. 1 by a known means. Alternatively, the first pipe 31 may be configured by processing the lower end portion of the first blow-by gas pipe 4.

The second pipe 32 is configured to have the same diameter as, for example, the first pipe 31. In this case, the first pipe 31 and the second pipe 32 can be formed by cutting a common pipe material. Is possible.
The second pipe 32 is connected to the fourth blow-by gas pipe 7 (see FIG. 1) by a known means. Alternatively, the end of the fourth blow-by gas pipe 7 on the side away from the oil pan 15 (see FIG. 1) may constitute the second pipe 32.

The first oil receiver 33 has a cylindrical portion 331, a bottom portion 332, and a bottom portion through hole 333. The through hole 333 is formed at the center of the bottom portion 332 formed in a cup shape by the cylindrical portion 331 and the bottom portion 332, and has a short cylindrical protrusion extending in the longitudinal direction of the second pipe 32.
The first oil receiver 33 is integrally attached to the second pipe 32 by press-fitting the upper end portion side of the second pipe 32 into the through hole 333.
That is, the oil reservoir 330 is configured by the space surrounded by the inner peripheral surface of the first oil receiver 33 and the outer peripheral surface of the second pipe 32. The oil reservoir 330 is shown as an annular gap E2 in FIG.

The cover member 34 has a cylindrical portion 341, a canopy portion 342, and a canopy portion through hole 343, and a short cylindrical shape is formed at the center of the canopy portion 342 formed in a cup shape by the cylindrical portion 341 and the canopy portion 342. A through hole 343 having a protrusion is formed. The cover member 34 is integrated with the first pipe 31 by press-fitting the large diameter portion 313 of the first pipe 31 into the through hole 343 so that the through hole 343 faces vertically upward. Yes.
The cover member 34 can be omitted. In that case, it is preferable that a member that generates high heat is not disposed on the extended line of the oil outlet indicated by the symbol γ. This is to prevent the oil ejected from the oil outlet γ from reaching the high heat member when the pressure in the oil pan 15 is abnormally increased.

  Referring to FIG. 3, the position of the upper end 331 t of the cylindrical portion 331 in the first oil receiver 33 is higher than the upper end position 32 t of the second pipe 32 and the large diameter portion 313 in the first pipe 31. The cover member 34 is disposed in an annular space E <b> 1 formed by the cylindrical portion 341. On the other hand, a lower end 313 b of the large diameter portion 313 in the first pipe 31 is disposed in an annular space E <b> 2 formed by the second pipe 32 and the cylindrical portion 331 in the first oil receiver 33.

Here, as shown in FIG. 2, in a state where oil is stored in the oil reservoir 330, the pressure in the region C <b> 1 radially inward with respect to the large diameter portion 313 of the first pipe 31 is the internal pressure of the crankcase 12. Equal to Pc. On the other hand, the pressure in the region C2 radially outside the large diameter portion 313 is equal to the atmospheric pressure Pa.
If the internal pressure Pc of the crankcase 12 increases, the oil level in the inner region C1 is pushed down by the pressure, and the oil level in the outer region C2 increases. When the internal pressure of the crankcase 12 rises beyond the allowable range, the oil in the oil reservoir 330 is discharged through the oil outlet (see FIGS. 2 and 3) indicated by γ.

3, the longitudinal dimension (vertical dimension in FIG. 3) of the second pipe 32 of the cylindrical portion 331 in the first oil receiver 33 and the depth from the upper surface of the bottom portion 332 to the upper end 32 t of the second pipe 32. The oil H stored in the first oil receiver 33 when the pressure of the oil pan 15 rises beyond the allowable range even when the first oil receiver 33 is filled with oil. Is set to be discharged to the outside through the oil outlet γ.
Further, the lower end 313b of the large-diameter portion 313 of the first pipe 31, the gap lambda ₁ and the upper surface of the bottom portion 332 of the first oil receiving 33, when the internal pressure Pc of the crankcase 12 is increased, the annular space E2 preferably, the oil was stored is the minimum value of the gap lambda ₁ can smoothly pass through the inside.
The gap λ ₂ between the upper end 331 t of the cylindrical portion 331 in the first oil receiver 33 and the lower surface of the canopy portion 342 in the cover member 34 is preferably a size that allows oil to smoothly pass through the gap λ _2. .

In FIG. 2, the second oil receiver 35 has a large-diameter cylindrical portion 351, a bottom portion 352, and a small-diameter cylindrical portion 353, and an oil discharge pipe 35 o is attached to the bottom portion 352.
When the second pipe 32 is press-fitted into the small diameter cylindrical portion 353, the second oil receiver 35 is integrally attached to the second pipe 32.
For example, a heat-resistant rubber hose 8 (oil return hose) is attached to the oil discharge pipe 35o by a known means (for example, a wire clip), and the tip of the rubber hose 8 is an oil pan 15 in the illustrated example. (See FIG. 1).
Note that the second oil receiver 35 and the (rubber hose) 8 may be omitted.

In FIG. 2, the relative positional relationship between the first pipe 31 and the second pipe 32 in the pressure adjusting device 2 is fixed. This is because if the relative positional relationship between the first pipe 31 and the second pipe 32 is not fixed, the oil reservoir 330 does not become uniform over the circumferential direction of the outer peripheral surface of the second pipe 32.
The relative position between the first pipe 31 and the second pipe 32 may be fixed by a known means.
In FIG. 2, white arrows indicate the flow of blow-by gas containing oil.

According to the illustrated embodiment, the oil contained in the gas flowing in the first pipe 31 and the second pipe 32 flows while adhering to the pipe inner wall and is stored in the oil reservoir 330. At that time, the flow of blow-by gas is not hindered.
The blow-by gas flowing in the pipe does not flow out of the first pipe 31 and the second pipe 32 due to the oil stored in the oil reservoir 330.

When the pressure in the crankcase 12 or the pressure Pc in the first pipe 31 and the second pipe 32 is increased to a predetermined value (threshold value) or more, the oil stored in the oil reservoir 330 by the pressure is oil. Pressed to the outlet γ side (region C2 side) and flows out from the oil outlet γ.
At this time, the region where the oil flows out is limited to a region where a flow path communicating from the oil reservoir 330 to the oil outlet γ is extended to the oil outlet γ side. For this reason, even if the cover member 34 is omitted in the illustrated embodiment, a high heat member such as an exhaust system or a belt may not be provided in a region where the flow path connecting the oil outlet γ from the oil reservoir 330 is extended. Even if the oil flowing out from the oil outlet γ flows out of the pipe, it is prevented from coming into contact with the high heat member, and the risk of ignition or the like is prevented.

  The oil outlet γ is extended in the illustrated embodiment even when a high heat member such as an exhaust system or a belt must be disposed in the region where the oil outlet γ is extended due to a request on the layout. By providing the cover member 34 that covers the region, the oil flowing out from the oil outlet γ is blocked by the cover member 34 and does not come into contact with the high heat member.

Further, when the pressure in the crankcase 12 or the pressure Pc in the first pipe 31 and the second pipe 32 becomes higher than the threshold value, the oil is removed from the pipe via the oil outlet γ. If it flows out, the pressure is also released, so that there is no possibility that the seal of the CCV filter is broken or the oil flows out from the broken portion of the seal.
In other words, the pressure adjusting device 3 also functions as a relief valve.

  Furthermore, in the embodiment shown in the drawing, if the oil reservoir 330 and the oil outlet γ are provided in the second pipe 32 through which oil-containing gas (blow-by gas) flows, it can be installed, so that it can be easily installed in an existing vehicle. It can be applied and the additional construction cost can be kept low.

It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.
For example, in the illustrated embodiment, the pressure adjusting device 3 is interposed in a region between the CCV filter 2 and the oil pan 15, but can also be interposed in a region between the CCV filter 2 and the rocker cover 14. is there.

DESCRIPTION OF SYMBOLS 3 ... Pressure regulator 4 ... 1st blow-by gas pipe 5 ... 2nd blow-by gas pipe 6 ... 3rd blow-by gas pipe 7 ... 4th blow-by gas pipe 8 ... Oil return hose 31 ... 1st pipe 32 ... 2nd pipe 33 ... 1st oil receiver 34 ... cover member 35 ... 2nd oil receiver

Claims (2)

Including a pipe through which gas containing oil communicates with the crankcase flows, an oil reservoir provided in the pipe, and an oil outlet formed on the radially outer side of the pipe;
The oil outlet communicates with the oil reservoir, and the oil outlet is located away from the crankcase with respect to the oil reservoir in the longitudinal direction of the pipe, and the pressure in the crankcase is higher than a predetermined value. In this case, the pressure adjusting device is provided at a position where oil leaks to the outside of the pipe via the oil outlet.   The pressure adjusting device according to claim 1, wherein a cover that covers a region extending to the oil outlet side is provided in a region in which a flow path communicating with the oil outlet from the oil reservoir portion is extended to the oil outlet side.

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