JPH0573217U - Blow-by gas gas-liquid separation chamber structure - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object to provide a blow-by gas-liquid separation chamber structure capable of favorably preventing the outflow of oil into the intake system. [Composition] A partition plate 4 capable of separating the oil liquid in the blow-by gas by forming a labyrinth in the gas passage is made of bimetal, and the partition plate 4 is brought into close contact with the inner wall of the case when the engine is warmed up, and when it is cold. A gap is formed to return the oil accumulated on the downstream side to the engine side by separating it from the inner wall of the case.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a blow-by gas gas-liquid separation chamber structure for separating oil in blow-by gas.

[0002]

[Prior art and its problems]

 Conventionally, the blow-by gas / liquid separation chamber mounted on the cylinder block, rocker cover or outside of the engine has a structure as shown in the plan view in FIG. 2 and the side sectional view in FIG. A baffle plate 2 is provided horizontally inside 1 and a gas passage through which blow-by gas G 2 passes is formed between the baffle plate 2 and the case 1 in order to maze the inside of this gas passage. The partition plates 4 and 4 are erected on the baffle plate 2 at a predetermined interval, and the oil in the blow-by gas G flows in the process of the blow-by gas G passing through the gas passages mazed by the partition plates 4 and 4. The liquid component is separated and only the gas component is made to flow from the outlet 5 to the intake system.

However, in such a conventional structure, the partition plates 4 and 4 are gradually crossed over a long period of time to allow oil to enter the downstream side, and even under special operating conditions, the partition plate 4 is crossed over. Oil may enter the downstream side of the partition plate 4 and accumulate in the downstream side. In that case, as shown in FIG. 4, the accumulated oil O is discharged from the outlet 5 when the vehicle body is tilted. There was a problem that it was sucked into the intake system.

[0004]

[Means for Solving the Problems]

 The present invention was devised in view of the above-mentioned conventional problems, and an object thereof is to provide a blow-by gas-liquid separation chamber structure in which oil does not flow out to an intake system, and the gist thereof is a case. A gas passage through which blow-by gas passes is formed between the baffle plate and the baffle plate, and a partition plate is provided in the gas passage to separate the oil liquid in the blow-by gas from the maze by separating the partition plate. Is made of a bimetal that is in close contact with the inner wall of the case when the engine is warming up, and changes its shape so as to form a gap that separates from the inner wall of the case when cold and returns the oil on the downstream side to the upstream side. ..

[0005]

[Action]

 The partition plate is made of bimetal that changes its shape depending on the temperature.When the engine warms up, the partition plate adheres to the case to perform a good blow-by gas gas-liquid separation function, and when the engine cools, the partition plate deforms. A gap is formed between the case and the inner wall of the case, so that the oil accumulated on the downstream side of the partition plate can be favorably returned to the engine side on the upstream side, and the oil can be prevented effectively from flowing out into the intake system. Be done.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan configuration diagram corresponding to FIG. 2, in which a gas passage for blow-by gas is formed in a case 1 forming a rocker cover and the like, and in this example, two partition plates 4 are arranged at predetermined intervals. , 4 are erected, and the partition plates 4, 4 are capable of abutting both ends thereof on the locking walls 1b, 1b projecting inwardly so as to face each other on the inner side of the case 1. Sealing materials 6 and 6 are attached to the locking walls 1b and 1b, respectively, and both end portions of the partition plates 4 and 4 are connected to the locking walls 1b and 1b through the sealing materials 6 and 6, respectively. It is formed in a structure that is in close contact with 1b. The other structure is the same as the conventional structure, and the description thereof is omitted.

The partition plates 4 and 4 in this example are made of bimetal, and the free ends of both ends thereof can be deformed into a curved shape due to temperature change. That is, when the engine is warmed up at a high temperature, the partition plates 4 and 4 are brought into close contact with the locking walls 1b and 1b by abutting both ends of the sealing plates 6 and 6, and when the engine is cold. Is set such that both ends thereof are curved in a direction away from the locking walls 1b, 1b to form a gap between the locking walls 1b, 1b.

Therefore, in such a structure, as shown in FIG. 4, even when the oil O collects on the downstream side of the partition plate 4, the space between the partition plate 4 and the locking wall 1b is maintained when the engine is cold. Since a gap is formed in the oil, the oil O can satisfactorily return to the upstream side, that is, the engine side. Therefore, the oil O does not flow out to the intake side, and various troubles caused by the oil O flowing out into the intake system are prevented. It can be prevented well.

[0009]

[Effect of the device]

 The blow-by gas gas-liquid separation chamber structure of the present invention forms a gas passage through which the blow-by gas passes between the case and the baffle plate, and makes the gas passage into a maze to allow the oil-liquid content in the blow-by gas to pass through. A partition plate to be separated is provided, and the partition plate is closely adhered to the inner wall of the case when the engine is warmed up, and when cold, separates from the inner wall of the case to form a gap for returning the oil on the downstream side to the upstream side. Since the shape is changed from bimetal, even if oil accumulates on the downstream side of the partition plate, the partition plate deforms when the engine cools to form a gap, and the collected oil can be returned to the engine side well. It is possible to prevent various troubles because oil does not flow out into the intake system, and it is possible to exert a good gas-liquid separation function during warm-up operation of the engine. With the results.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a blow-by gas-liquid separation chamber.

FIG. 2 is a plan configuration diagram corresponding to FIG. 1 of a conventional structure.

FIG. 3 is a side sectional configuration diagram of FIG.

FIG. 4 is a side cross-sectional configuration diagram showing a state where oil is collected on the downstream side of the partition plate.

[Explanation of symbols]

 1 Case 1b Locking wall 2 Baffle plate 4 Partition plate 6 Seal material G Blow-by gas O Oil

Claims (1)

[Scope of utility model registration request] 1. A gas passage through which a blow-by gas passes is formed between a case and a baffle plate, and a partition plate is provided in the gas passage to separate the oil liquid component in the blow-by gas by making the gas passage a labyrinth. The partition plate is formed of a bimetal that is in close contact with the inner wall of the case when the engine is warmed up, and changes its shape so as to form a gap that separates from the inner wall of the case and returns the oil on the downstream side to the upstream side when the engine is cold. A blow-by gas-liquid separation chamber structure characterized in that