JP2689655B2 - Blow-by gas reduction device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blow-by gas treatment device for an engine, and particularly to a blow-by gas that separates oil mist contained in blow-by gas and efficiently collects it in an oil reservoir of the engine. The present invention relates to a gas reduction device.

[Conventional technology]

Blow-by gas is sucked and taken out from the engine crank chamber or the head cover (blow-by gas chamber) of the cylinder head that communicates with it, and the mist-like oil component contained in the blow-by gas is condensed and separated and collected. Various types of blow-by gas reducing devices have been developed in the past, which blow the separated blow-by gas into the combustion chamber from the intake pipe of the engine and incinerate it.

[Problems to be Solved by the Invention] Conventionally, how to efficiently separate oil mist from blow-by gas, that is, the focus of research is on the separator, and the agglomerated oil of the oil separator Satisfactory means have not yet been developed for rapid and positive recovery from the oil sump means to the oil sump (oil pan etc.) of the engine.

If the oil that has accumulated in the oil reservoir of the oil separator is left uncollected, it is common for any type of separator to lose its ability to separate oil mist. Increase, the accumulation of deposits in the intake system, and problems with exhaust pollution.

However, installing a special pump only for the purpose of transferring oil from the oil sump means of the oil separator to the oil sump of the engine poses problems in terms of cost, structure complexity, power loss, etc. Not at all.
Also, the method of collecting by utilizing the natural flow due to gravity while the engine is stopped cannot be used during operation, so when the engine is operated for a long time, the oil reservoir of the oil separator becomes saturated. May be.

In order to solve such a problem, the present invention utilizes an ordinary mechanism that a general engine naturally has,
It is an object of the invention to develop means for actively collecting oil from a separator to an engine while the engine is operating.

[Means for solving the problem]

The present invention, as means for solving the above problems,
In the middle of the blow-by gas passage that sucks blow-by gas from the blow-by gas chamber in the head cover of the cylinder head that communicates with the upper space of the crank chamber of the engine and guides it to the intake pipe of the engine, A separation means for separating and capturing the oil mist is provided, and a container-shaped oil storage means for collecting and condensing the oil separated and condensed in the separation means is additionally provided to the separation means, and further added by an oil pump. Negative pressure generating means for generating a negative pressure by utilizing the jet flow of the pressurized oil is provided at a portion where a part of the pressurized oil is injected toward the oil sump of the engine, and the container-like oil is provided. Provided is a blow-by gas reduction device, characterized in that the accumulating means and the negative pressure generating means are connected by an oil suction passage. It is intended.

(Operation)

Since the present invention has the configuration as described above, the blow-by gas sucked from the blow-by gas chamber of the engine or the like into the intake pipe is separated into oil mist by the separating means provided in the middle of the passage, and almost no oil is contained. It enters the combustion chamber of the engine through the intake pipe and burns without containing it. The separated oil mist aggregates and returns to liquid oil, and is stored in a container-shaped oil reservoir provided in the separator. Since the function of the separating means is adversely affected when the amount of the oil increases, it is necessary to promptly collect the oil in the oil sump of the engine. However, in the present invention, a part of the oil pressurized by the oil pump of the engine is used in the engine. At the location where the pressure is released toward the oil sump and the pressure is lost, a negative pressure generating means for generating a jet of oil due to the pressure difference and generating a negative pressure by using the jet is provided. The oil accumulated in the container-shaped oil reservoir means is sucked by the negative pressure of the negative pressure generating means through the oil suction passage,
Since the oil returns to the oil sump of the engine together with the jet of oil, the oil is quickly collected in the oil sump of the engine without being stagnant in the separating means.

〔Example〕

FIG. 1 shows a first embodiment of the present invention. From the upper space of the crank chamber of the engine (not shown) or the blow-by gas chamber in the head cover that communicates with the crank space of the engine, an oil separator 1 is provided in the middle of a blow-by gas reducing passage communicating with the intake pipe.
(Example of separating means for separating oil mist from blow-by gas) is installed.

Therefore, first, an embodiment of the oil separator 1 will be described with reference to FIGS. 2 and 3. The illustrated oil separator 1 includes a swirl flow generator 101 and a suction trapper 102. The swirl flow generation device 101 is of a cylindrical type and includes a blow-by gas inlet 103, a cylindrical casing 104, an inner cylinder 105, and a blow-by gas outlet 106. The casing 104, the inner cylinder 105, and the blow-by gas outlet 106 are concentric with each other, and a blow-by gas inlet 103 is opened tangentially on the side surface of the cylindrical casing 104.

The suction trapper 102 includes a blow-by gas inflow passage 107,
The outflow passage 108, the cylindrical casing 109, and the oil suction passage 110 are provided. The suction trapper 102 has a taper screw 11
It is screwed to the swirl flow generator 101 coaxially with the blow-by gas outlet 106 by 2. The blow-by gas inflow passage 107 and the inner diameter of the cylindrical casing 109 have a smaller relationship in the blow-by gas inflow passage 107 than the cylindrical caging 109, and the blow-by gas inflow passage 107 is smaller than the inner wall bottom surface of the cylindrical casing 109. The annular groove 111 projects upward and is formed by the outer wall of the blow-by gas inflow passage 107 and the inner wall side surface and inner wall bottom surface of the cylindrical casing 109.
(Example of container-shaped oil reservoir means) is formed. Annular groove
111 has one end of the oil suction passage 110 opened, and its opening direction is the same tangential direction as the swirling direction of the blow-by gas generated by the swirling flow generating device 101, as is clear from FIG. It is configured. The blow-by gas outflow passage 108 communicates with the intake pipe of the engine via a blow-by gas returning passage (not shown). Also,
The oil suction passage 110 communicates with a jet pump 2 (an example of negative pressure generating means for generating negative pressure by utilizing a jet flow of pressurized oil) described later.

Next, the structure of the jet pump 2 of the first embodiment will be described with reference to FIG. The jet pump 2 in the first embodiment comprises a housing 201 and a nozzle 202. The housing 201 is cylindrical and has an oil inflow passage 203, a negative pressure generating chamber 204, and an oil outflow passage 205 formed therein. The oil inflow passage 203, the negative pressure generating chamber 204, and the oil outflow passage 205 are all communicated in a concentric relationship, and the diameters of the passages are such that the oil inflow passage 203> the negative pressure generating chamber 204> the oil outflow passage 205. ing. The nozzle 202 has a narrowed portion 206 that narrows in a taper shape, and is press-fitted into the housing 201 from the oil inflow passage 203 toward the negative pressure generation chamber 204. In the negative pressure generating chamber 204, the oil suction passage 110 of the oil separator 1 is opened via an oil check valve 207. Further, the housing 201 has a structure in which the oil inflow passage 203 is opened at the sliding portion of the piston 301 of the hydraulic relief valve 3.
It is screwed to the casing 302 of the hydraulic relief valve 3 described later.

The hydraulic relief valve 3 includes a piston 301 and a casing 3.
It consists of 02 and spring 303. The piston 301 is slidably inserted into a casing 302, and a spring 303 resists the pressure of pressurized oil discharged from an oil pump 4 described later,
It is urged in a direction to block the oil inflow passage 203.

The oil pump 4 is a pump for supplying oil to each lubricating portion of the engine, is driven by a crankshaft of an engine (not shown), and has an oil intake passage 401, an oil supply passage 402, and an oil relief passage 403. The oil relief passage 403 can communicate with an oil pan (oil sump of the engine) of a crank chamber (not shown) via the hydraulic relief valve 3 and the jet pump 2.

Next, the operation of the first embodiment shown in FIGS. 1 to 3 will be described. The blow-by gas containing the oil mist flows into the blow-by gas inlet 103 of the swirl flow generator 101 of the oil separator 1 from the upper space of the crank chamber or the blow-by gas chamber in the head cover communicating with the crank chamber. The blow-by gas that flows in is casing together with the oil mist.
After flowing downward while swirling along the inner wall surface of the cylinder 104, it rises while swirling along the inner wall surface of the inner cylinder 105 and into the blow-by gas inflow passage 107 of the suction trapper 102 through the blow-by gas outlet 106. invade.

During this time, most of the oil mist contained in the blow-by gas is separated from the blow-by gas by inertial force and adheres to the inner wall surfaces of the casing 104 of the swirl flow generator 101, the inner cylinder 105, and the blow-by gas inflow passage 107 of the suction trapper 102. By doing so, it is captured and becomes a liquid film. Further, the blow-by gas and the liquefied oil that have reached the blow-by gas inflow passage 107 of the suction type trapper 102 flow out to the cylindrical casing 109 from the protruding portion of the blow-by gas inflow passage 107. At this time, due to the expansion of the passage diameter, a low-pressure adhering vortex is generated from the blow-by gas inflow passage 107 to the cylindrical casing 109, and the liquid filmed oil is trapped in the annular groove 111 and collects at the bottom of the groove. On the other hand, the clean blow-by gas separated from the oil is sucked into the intake pipe of the engine from the blow-by gas outflow passage 108 through a blow-by gas reducing passage (not shown) and sent to the combustion chamber. A swirling flow generator
Since the direction of the swirling flow generated by 101 and the opening direction of the oil suction passage 110 are the same tangential direction, the oil trapped in the annular groove 111 can be sucked and recovered smoothly.

Next, the oil suction operation by the jet pump 2 which is the main part of the first embodiment will be described. The oil pump 4 sucks oil from an oil pan (not shown) of the engine through the oil suction passage 401, and sends the oil under pressure to an oil supply passage 402 that communicates with various parts of the engine that require lubrication. When the engine speed is about 2,000 rpm or more, the supplied hydraulic pressure is 4 kg / cm ²
As described above, a part of the pressure-fed oil passes through the oil relief passage 403, and the piston 301 of the hydraulic relief valve 3
Is pushed against the spring 303 to open the oil inflow passage 203 of the jet pump 2, so that the oil is injected from the nozzle 202 to the oil outflow passage 205. At this time, as a result of the oil jet entraining the surrounding air, the negative pressure generating chamber 204 becomes negative pressure. The pressure in the negative pressure generating chamber 204 is the annular groove of the suction trapper 102.
When the pressure becomes lower than the pressure of 111, the oil that has accumulated in the annular groove 111 together with a part of the blow-by gas and the oil suction passage
It is sucked into the negative pressure generation chamber 204 through the oil check valve 207. The sucked oil and air together with the jet flow of the oil jetted from the nozzle 202, the oil outflow passage 205
After that, the oil is returned to the oil pan (not shown) in the crank chamber.

FIG. 4 shows a second embodiment of the present invention. The oil separator may be the same as that shown in FIGS. 2 and 3 as in the first embodiment, but the portion following it may be This is different from the first embodiment. That is, the second embodiment is characterized in that it has a structure in which the hydraulic relief valve 3 and the jet pump 2 in the first embodiment are integrated.

As shown in FIG. 4, a jet pump 5 with a relief valve has a valve body 503 having a conical head inserted into a cylinder 502 in a main body 501 and a valve body 50 urged by a spring 504.
3 includes a valve port 505 that is closed, a negative pressure generating chamber 506 formed on the downstream side of the valve port, an oil outflow passage 507 that communicates with the crank chamber of the engine, a check valve 508, and the like.

When the discharge pressure of the oil pump 4 described above in the oil relief passage 403 exceeds a predetermined value, the valve body 503 is pushed up against the spring 504, and oil is jetted from the valve port 505 to the oil outflow passage 507. The surrounding air is entrained by the jet of oil at that time, and the negative pressure generation chamber 506 becomes negative pressure, so the check valve 508 opens and the oil accumulated in the annular groove 111 of the oil separator 1 through the oil suction passage 110. Is sucked, and returns to the oil pan of the crank chamber (not shown) together with the jet flow of oil from the valve port 505.

In each of the above-described first and second embodiments, a jet pump is provided that utilizes the pressure difference generated when the excessive pressure at the discharge port of the oil pump 4 is released to the oil pan of the crank chamber by the relief valve, Although the oil separated from the blow-by gas is recovered, as a third embodiment (not shown), for example, when the oil is injected from the crank chamber toward the inner surface of the piston to cool and lubricate the piston and the cylinder. Alternatively, the oil nozzle used for injecting oil to the valve operating cam mechanism in the cylinder head cover may be replaced by the jet pump 2 described above.
With the structure as shown in FIG. 1, the accumulated oil is sucked from the annular groove 111 (generally, oil sump means) of the oil separator 1 and placed on the jet of oil for cooling and lubrication. The structure may be such that it is blown to the right place. Also in this case, the injected oil returns to the oil pan of the crank chamber, so that the oil can be promptly recovered from the annular groove 111 or the like as in the first and second embodiments.

〔The invention's effect〕

According to the present invention, the oil accumulated in the container-like oil sump means of the separation means for separating the oil mist from the blow-by gas is promptly recovered in the oil sump of the engine, so that the oil sump means is saturated and the separation ability is lowered. There is no fear of doing so. Therefore, the high oil mist separation ability is always maintained, the decrease in the amount of oil can be prevented, and the accumulation of deposits in the intake system and the occurrence of exhaust pollution can be avoided.

Further, in the present invention, there is no need to newly install a special power pump for oil recovery, and since the pressure difference of the oil circulation system that a general engine necessarily has is utilized, the structure becomes complicated or It does not increase the cost or increase the power loss.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a longitudinal sectional front view showing an enlarged main part thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a second embodiment. It is a longitudinal cross-sectional view showing a main part. 1 ... Oil separator, 2 ... Jet pump, 3 ... Hydraulic relief valve, 4 ... Oil pump, 5 ... Jet pump with relief valve, 101 ... Swirl flow generator, 102 ... Suction trapper, 103 ... Blow-by gas inlet, 104 ... Cylindrical casing, 105 ... Inner cylinder, 106 ... Blow-by gas outlet, 107 ... Blow-by gas inflow passage, 108 ... Blow-by gas outflow passage, 109 ... Cylindrical type Casing, 110 ... Oil suction passage, 111 ... Annular groove, 112 ... Tapered screw, 201 ... Housing, 202 ... Nozzle, 203 ... Oil inflow passage, 204 ... Negative pressure generating chamber, 205 ... Oil Outflow passage, 206 ... throttle, 207 ... check valve, 301 ... piston, 302 ... casing, 303 ... spring, 401 ... oil suction passage, 402 ... oil supply passage, 403 ... oil relief Aisle, 501 …… Main body, 502 …… Cylinder, 503 …… Valve element, 504 …… Spring, 505 …… Valve opening, 506 …… Negative pressure generating chamber, 507 …… Oil outflow passage, 508 …… Check valve.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masaki Takeyama 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Japan Auto Parts Research Institute (72) Inventor Norio Sasajima 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Stock Company Japan (72) Inventor Ikuo Watanabe 14 Iwatani, Shimohakaku-cho, Nishio City, Aichi Prefecture Japan Auto Parts Research Institute, Inc.

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A blow-by gas is sucked from a blow-by gas chamber in an upper space of a crank chamber of an engine or a head cover of a cylinder head which communicates with the crank chamber, and the blow-by gas is guided to an intake pipe of the engine. A separating means for separating and capturing oil mist from the blow-by gas is provided, and a container-like oil storing means for collecting and collecting the oil separated and condensed in the separating means is attached to the separating means. A part of the oil pressurized by the oil pump is injected toward the oil sump of the engine by providing a negative pressure generating means for generating a negative pressure using the jet of the pressurized oil, Blow-by gas reduction, characterized in that the container-shaped oil reservoir means and the negative pressure generating means are connected by an oil suction passage. Location.