CN219548952U - Ventilation structure of built-in crankcase of cylinder block - Google Patents

Abstract

The utility model discloses a ventilation structure of a built-in crankcase of a cylinder body, which is arranged in the middle position in the cylinder body and integrated on the cylinder body, and comprises a ventilation structure main body, wherein the ventilation structure main body is a cavity, the center of the top of the ventilation structure main body is connected with an air outlet, a plurality of oil baffles are arranged in the ventilation structure main body, and the bottom of each oil baffle is provided with an oil return channel; the bottom of the ventilation structure main body is provided with a plurality of air inlets at the position of the crankcase, which is close to the main bearing wall; an oil baffle plate is arranged between the air outlet and two air inlets closest to the two sides of the air outlet. According to the utility model, gaps between the inner wall of the cylinder body and the partition plate and between the partition plate and the convex ribs are used as the oil-gas flowing channels, oil drops are separated through gravity sedimentation by stabilizing the oil-gas pressure and changing the oil-gas flowing direction and performing multiple collisions with the oil baffle plate, the inner wall of the engine body and the convex ribs, the oil-gas separation effect is improved, and separated engine oil returns to the oil pan through the oil return channel without arranging an independent oil return channel.

Description

Ventilation structure of built-in crankcase of cylinder block

Technical Field

The utility model relates to a ventilation structure of a built-in crankcase of a cylinder block, and belongs to the field of ventilation structures of built-in crankcases of engine cylinder blocks.

Background

During operation of the engine, the high pressure combustible mixture and the combusted gases within the combustion chamber leak into the crankcase through the clearance between the piston and the cylinder, causing blow-by. The blowby gas can dilute the engine oil, reduce the service performance of the engine oil, accelerate the oxidation and deterioration of the engine oil, and cause the corrosion and accelerated abrasion of engine parts; blow-by gas also can cause the pressure of the crankcase to be too high to break the seal of the crankcase, causing oil leakage to run off. In order to prevent the pressure of the crankcase from being too high, prolong the service life of engine oil, reduce the abrasion and corrosion of parts and meet strict discharge requirements, a crankcase ventilation system design is necessary, so that the oil and the gas in the oil-gas mixture are effectively separated, the oil returns to the crankcase, the gas enters a gas system to be burnt, and the discharge of pollutants is reduced.

At present, most engine crankcase ventilation systems are arranged on a cylinder head cover, and oil and gas are pre-separated by arranging an oil baffle plate to enable the oil and gas to flow along a wall surface and be adsorbed on the wall surface; also part of the engine crankcase ventilation system is arranged on the cylinder block, the utility model disclosed in the application number CN 201193552Y discloses a crankcase ventilation structure with a built-in passage of the cylinder block, ventilation openings are arranged at the upper part of each cylinder crankcase of the cylinder block near the main bearing wall, all ventilation openings are connected with the upper part of the cylinder block through passages on the side surface of the cylinder block, and a main ventilation opening is arranged on the main passage and is connected with external crankcase ventilation system components.

The crankcase ventilation system arranged on the cylinder cover cap has the advantages that as the distance of the oil baffle is longer, the air inlet is single, the air flow speed is uneven, the oil-gas separation effect is not obvious, the number of the partition plates is required to be increased for increasing the contact area of oil gas and the partition plates, the cost is higher, and meanwhile, an independent oil return channel is required to be designed, so that the structure is more complicated;

the crankcase ventilation system arranged on the cylinder body is provided with the oil baffle between the channel on the side surface of the cylinder body and the main channel on the upper part of the cylinder body, so that the oil-gas flow rate in the channel can not be controlled, and meanwhile, the main ventilation opening is close to the ventilation opening at the position of the right main bearing wall, and the oil-gas can not be thoroughly separated in the channel and then enter the crankcase ventilation system part, so that the integral oil-gas separation effect is not obvious.

Disclosure of Invention

The utility model aims to solve the technical problems that: under the condition of not increasing the number of the partition plates, the problem of uneven gas flow speed of a crankcase ventilation system on the cylinder head cover is avoided; and how to avoid the problem that the oil gas flow rate in the passage of the crankcase ventilation system on the cylinder block cannot be controlled.

In order to solve the technical problems, the technical scheme of the utility model provides a ventilation structure of a built-in crankcase of a cylinder body, which is characterized in that the ventilation structure is arranged in the middle position of the cylinder body and integrated on the cylinder body, and comprises a ventilation structure main body, wherein the ventilation structure main body is a cavity, the center of the top of the ventilation structure main body is connected with an air outlet, a plurality of oil baffles are arranged in the ventilation structure main body, and the bottom of each oil baffle is provided with an oil return channel; the bottom of the ventilation structure main body is provided with a plurality of air inlets at the position of the crankcase, which is close to the main bearing wall; an oil baffle plate is arranged between the air outlet and two air inlets closest to the two sides of the air outlet.

Preferably, convex ribs are arranged on the top of the inner wall of the ventilation structure main body and positioned on two sides of the air outlet.

Preferably, convex ribs are respectively arranged between the two nearest oil baffle plates at the two sides of the air outlet.

Preferably, the whole cavity is divided into a plurality of oil-gas separation cavities by an oil baffle plate; the air outlet is arranged in one of the oil-gas separation cavities, and all the remaining oil-gas separation cavities are respectively provided with an air inlet.

Preferably, the air outlet penetrates through the outer surface of the cylinder body.

Preferably, the distance between the oil baffle plate and the top of the cavity is 5-10 mm.

The crankcase ventilation structure is integrated on the cylinder body, has compact structure without adding other parts, and has lower cost. Set up shelves oily baffle, oil return channel and protruding muscle structure in the oil-gas separation chamber, utilize between cylinder body inner wall and the baffle, the clearance between baffle and the protruding muscle is as the passageway of flowing through of oil gas, through stable oil gas pressure and change oil gas flow direction and shelves oily baffle, the organism inner wall, the protruding muscle carries out a plurality of collisions, increased the contact area and the collision number of times of oil gas and baffle and cylinder body inner wall, the air outlet is higher than the air intake that main bearing wall department was arranged simultaneously, oil gas carries out the collision once more with the protruding muscle of cylinder body upper wall before getting into the air intake, separate the oil drop through gravity settling, the oil separation effect has been improved, the engine oil after the separation returns to in the oil pan through the oil return channel, need not to arrange alone oil return channel.

Drawings

Fig. 1 is a schematic structural view of a cylinder block;

FIG. 2 is a cross-sectional view of C-C in FIG. 1;

FIG. 3 is a schematic view of a crankcase ventilation structure with a built-in cylinder block (an enlarged schematic view of the position A in FIG. 2);

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a cross-sectional view A-A of FIG. 4;

fig. 6 is a B-B cross-sectional view of fig. 5.

Detailed Description

In order to make the utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

The in-cylinder crankcase ventilation structure a of the present utility model is disposed at an intermediate position within the cylinder block 11 and is integrated with the cylinder block 11, as shown in fig. 1, 2, which is similar to a rectangular cavity. As shown in fig. 3 and 4, the ventilation structure a of the built-in crankcase of the cylinder block provided by the utility model comprises a ventilation structure main body, wherein the ventilation structure main body is of a cavity structure, the top center of the ventilation structure main body is connected and communicated with an air outlet 7, the air outlet 7 penetrates through the outer surface of a cylinder block 11, ribs 6 are arranged on the left side and the right side of the air outlet 7 on the top of the inner wall of the ventilation structure main body, a plurality of oil baffle plates 8 are arranged in the cavity (namely the ventilation structure main body), the distance between the oil baffle plates 8 and the top of the cavity is 5-10 mm, the bottom of each oil baffle plate 8 is provided with an oil return channel 9, as shown in fig. 3 and 5, the whole cavity is divided into 5 oil-gas separation cavities through the oil baffle plates 8, namely a first oil-gas separation cavity 1, a second oil-gas separation cavity 2, a third oil-gas separation cavity 3, a fourth oil-gas separation cavity 4 and a fifth oil-gas separation cavity 5, the first oil-gas separation cavity 1, the second oil-gas separation cavity 2, the fourth oil-gas separation cavity 4 and the fifth oil-gas separation cavity 5 are arranged at the position of the crankcase near the main bearing wall, and the air inlet 10 is not connected with the third oil-gas separation cavity 3 through the oil baffle plates 8, as shown in fig. 6.

After oil gas enters the first oil-gas separation cavity 1, the second oil-gas separation cavity 2, the fourth oil-gas separation cavity 4 and the fifth oil-gas separation cavity 5 through the air inlet 10, the oil gas can strike the inner wall of the cylinder block 11 and the oil baffle plate 8, so that the oil gas pressure is stabilized, the direction is changed, the preliminary pressure stabilizing sedimentation is completed, oil drops are separated, when the oil gas which is subjected to preliminary sedimentation enters the third oil-gas separation cavity 3 through a gap between the oil baffle plate 8 and the top of the cavity, the oil drops can collide with the rib 6 on the upper wall of the cylinder block 11, so that the oil drops are separated, fine oil drops are separated in the third oil-gas separation cavity 3 through secondary pressure stabilizing sedimentation, the separated oil drops finally flow back to the oil pan through the air inlet 10 through the oil return channel 9, and the separated gas enters the oil-gas separator through the air outlet 7 for secondary separation.

Claims (6)

1. The ventilation structure of the built-in crankcase of the cylinder block is characterized by being arranged in the middle position in the cylinder block (11) and integrated on the cylinder block (11), and comprises a ventilation structure main body, wherein the ventilation structure main body is a cavity, the center of the top of the ventilation structure main body is connected with an air outlet (7), a plurality of oil baffles (8) are arranged in the ventilation structure main body, and an oil return channel (9) is arranged at the bottom of each oil baffle (8); the bottom of the ventilation structure main body is provided with a plurality of air inlets (10) at the position of the crankcase, which is close to the main bearing wall; an oil baffle plate (8) is arranged between the air outlet (7) and two air inlets (10) closest to the two sides of the air outlet.

2. The ventilation structure of the built-in crankcase of the cylinder block according to claim 1, wherein ribs (6) are arranged on the top of the inner wall of the ventilation structure main body and on two sides of the air outlet (7).

3. The ventilation structure of the built-in crankcase of the cylinder block according to claim 2, wherein the convex ribs (6) are respectively arranged between the two nearest oil baffle plates (8) at the two sides of the air outlet (7).

4. A crankcase ventilation structure with built-in cylinder block according to claim 1, 2 or 3, wherein the whole cavity is divided into a plurality of oil-gas separation cavities by an oil baffle plate (8); the air outlet (7) is arranged in one of the oil-gas separation cavities, and the air inlets (10) are respectively arranged in all the remaining oil-gas separation cavities.

5. A crankcase ventilation structure built in a cylinder block according to claim 1, wherein the air outlet (7) penetrates an outer surface of the cylinder block (11).

6. A crankcase ventilation structure with built-in cylinder block according to claim 1, wherein the distance between the oil baffle (8) and the top of the cavity is 5-10 mm.