CN207701200U - Crankcase ventilation structure - Google Patents

Abstract

The utility model provides a crankcase ventilation structure, which belongs to the field of locomotive accessories. It solves the existing problem of icing in the small-load curved channel of the crankcase under the high-cold environment. In this crankcase ventilation structure, the crankcase includes a cylinder head and a cylinder head cover arranged on the cylinder head. The cylinder head cover is provided with an oil-gas separator for receiving combustion chamber and crankcase exhaust gas, and an intake manifold is arranged on the cylinder head. The cylinder head is provided with an intake port that communicates with the intake manifold and the combustion chamber. The ventilation structure includes a first channel that is disposed in the cylinder head cover and communicates with the outlet of the oil-gas separator, and is disposed in the cylinder head and communicates with the intake port. The connected second channel, the first channel communicates with the second channel. The whole small-load curved channel of the utility model is completely integrated inside the cylinder head assembly, and the high-temperature heat conduction during the operation of the cylinder head completely avoids the risk of freezing of the small-load curved channel in winter, and at the same time reduces the cost and improves the work of the engine reliability.

Description

crankcase ventilation structure

technical field

The utility model belongs to the field of locomotive accessories and relates to a crankcase ventilation structure.

Background technique

During the operation of the automobile engine, the high-pressure combustible mixture and burned gas in the combustion chamber will more or less leak into the crankcase through the gap between the piston group and the cylinder, causing blow-by gas, which is composed of unburned Fuel gas, water vapor and exhaust gas, etc., will dilute the engine oil, reduce the performance of the engine oil, and accelerate the oxidation and deterioration of the engine oil. Usually, the active crankcase ventilation system can be used to ventilate the crankcase, which is to reintroduce the blow-by gas from the combustion chamber through the oil-gas separator into the intake system of the internal combustion engine to burn in the combustion chamber to achieve the purpose of ventilation.

Existing turbocharged engine crankcase ventilation systems usually include small-load channels and large-load channels. When the engine is at low speed, the small-load channel is used for ventilation, and when the engine is high-speed, due to the increase in gas pressure, the large-load channel is used for ventilation. ventilation. Most of the existing ventilation methods for small-load channels use external pipeline connections to conduct gas, but this external pipeline connection has the disadvantage that in winter in high-latitude areas, the small-load channels are narrow and When exposed to the external low temperature environment, the water vapor contained in the gas is prone to freezing, resulting in the blockage of the small-load curved passage, causing excessive crankcase pressure, oil leakage and other faults.

my country's patent application document (notification number: CN203022842U; announcement date: 2013.06.26) discloses a new crankcase ventilation pipe heater structure, in which a heating layer is set in the joint of the crankcase ventilation pipe, and the heating layer passes through the ECU of the engine control, the heating layer can heat the inside of the tube, ensuring the reliability of the crankcase ventilation system when used in alpine regions.

Although this structure can prevent icing to a certain extent, it will lead to increased costs, and as the engine ages, the heat preservation measures will easily fail, which will eventually lead to icing of the small-load curved channel. Therefore, the above-mentioned technology cannot effectively solve the problem of icing in the small-load tortuous channel.

Contents of the invention

The utility model aims at the above-mentioned problems existing in the existing technology, and provides a crankcase ventilation structure. The technical problem to be solved by the utility model is: in the high cold environment, the problem of freezing of the crankcase small-load curved channel.

The purpose of this utility model can be achieved through the following technical solutions:

A crankcase ventilation structure. The crankcase includes a cylinder head and a cylinder head cover arranged on the cylinder head. The cylinder head cover is provided with an oil-gas separator for receiving combustion chamber and crankcase exhaust gas. The cylinder head is provided with There is an intake manifold for supplying air to the engine. The cylinder head is provided with an intake passage connecting the intake manifold and the combustion chamber. The ventilation structure further includes a second passage arranged in the cylinder head and communicating with the intake passage, the first passage and the second passage communicate with each other.

The channel used for small-load ventilation is changed from the external hose structure to the inside of the cylinder head and the cylinder head cover, so that the exhaust gas from the oil-gas separator does not need to pass through the external pipeline directly through the cylinder head and the first cylinder cover inside the cylinder cover. The channel and the second channel can enter into the air channel and return to the combustion chamber for combustion, and the entire first channel and the second channel are completely integrated in the cylinder head and the cylinder head cover. When the engine is working, the heat of the cylinder head itself can be transferred to keep the temperature in the first channel and the second channel at a relatively high level, thus avoiding the channel from freezing when the vehicle is driving in the alpine region Happening. Moreover, the long-term stable use of the channel can be guaranteed, the cost is reduced, and the reliability of the engine operation is improved.

In the crankcase ventilation structure described above, the first channel includes a first horizontal curved channel and a first vertical curved channel that communicate with each other, and the first vertical curved channel communicates with the gas outlet of the oil-gas separator , the first transverse curved passage communicates with the second passage, and the connection point is located on the contact surface between the cylinder head cover and the cylinder head. The specific distribution of the first channel is set as the first horizontal curved channel and the first vertical curved channel, and at the same time, the connection point is located on the contact surface, which can facilitate people's manufacturing in the production process, and the direct slotting is perpendicular to each other The blind road can realize the construction of the channel.

In the above-mentioned crankcase ventilation structure, the second channel includes a second vertical curved channel, a second oblique curved channel and a second transverse curved channel connected in sequence from end to end, and all three are linear blind channels. Pore structure, the second vertical curved channel communicates with the first channel, and an air guide channel for communicating with each other is provided between the second transverse curved channel and the air inlet. Utilizing the linear blind channel structure can facilitate people to process and shape the second channel, and it is convenient to reasonably avoid the distribution structure on the cylinder head.

In the crankcase ventilation structure described above, the number of intake ports in the cylinder head is the same as the number of combustion chambers and corresponds one-to-one, and the number of air guide channels is the same as the number of intake ports and corresponds one-to-one. The corresponding relationship between the air guide channel and the intake port can basically maintain an equal amount of gas in each combustion chamber of the intake manifold, and the gas enters each combustion chamber evenly, so that the engine runs smoothly.

In the crankcase ventilation structure described above, the intervals between two adjacent air guide passages and the communication openings of the second transverse curved passage are the same. The structure with the same interval can allow the air in the second transverse curved channel to flow into the air guide channel evenly, avoiding the difference in air volume caused by different intervals.

In the above-mentioned crankcase ventilation structure, the contact surface between the cylinder head cover and the cylinder head is a plane, and the plane structure is convenient for mutual bonding, and can improve mutual precision. Able to stabilize air conduction.

Compared with the prior art, the utility model has the following advantages:

1. The entire curved small-load passage is completely integrated inside the cylinder head assembly, and the risk of freezing of the small-load curved passage in winter is completely avoided through the high-temperature heat conduction of the cylinder head during operation.

2. Compared with the external small-load channel pipeline, the utility model reduces the number of parts, reduces the cost, and improves the working reliability of the engine.

Description of drawings

Fig. 1 is a structural schematic diagram of the crankcase ventilation structure.

Fig. 2 is a cross-sectional view at A-A in Fig. 1 .

Fig. 3 is a cross-sectional view at B-B in Fig. 1 .

Fig. 4 is a cross-sectional view at C-C in Fig. 1 .

Fig. 5 is a partial cross-sectional view at D-D in Fig. 1 .

Among the figure, 1, the cylinder head cover; 11, the first channel; 111, the first horizontal curved channel; 112, the first vertical curved channel; 12, the oil-gas separator; 121, the small load channel of the oil-gas separator; 2 , cylinder head; 21, the second channel; 211, the second vertical curved channel; 212, the second oblique curved channel; 213, the second transverse curved channel; 213a, sealed steel ball; 214, the air guiding channel; 23. Intake manifold; 24. Intake duct.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in Figure 1, a crankcase ventilation structure, the crankcase includes a cylinder head 2, a cylinder head cover 1 is arranged on the cylinder head 2, and an oil-gas separator 12 for receiving combustion chamber exhaust gas is arranged on the cylinder head cover 1. The cylinder head 2 constitutes the top of the combustion chamber of the engine, and the exhaust gas after combustion in the combustion chamber and the exhaust gas leaked from the crankcase enter the oil-air separator 12, and then the unburned sufficient oil and gas are recovered. The cylinder head 2 is provided with an intake manifold 23 for supplying air to the engine. The intake manifold 23 is used to receive oil and gas. The cylinder head 2 is provided with an intake passage 24 communicating with the intake manifold 23 and the combustion chamber. It flows from the intake manifold 23 into the intake passage 24, and after passing through the intake passage 24, it flows into the combustion chamber through the opening and closing adjustment of the engine valve for combustion. The number of intake ports 24 is consistent with the number of combustion chambers on the cylinder head 2 and corresponds one to one, so that the airflow in the intake manifold 23 can evenly flow into each combustion chamber.

The oil-air separator 12 is provided with an oil-air separator small-load passage 121 , which is a ventilation passage under the condition of low engine speed. The cylinder head cover 1 is provided with a first passage 11 communicating with the small load passage 121 of the oil-air separator, and the cylinder head 2 is provided with a second passage 21 communicating with the intake passage 24. The first passage 11 and the second passage 21 are connected to each other. In communication, the first channel 11 and the second channel 21 jointly constitute a crankcase ventilation structure. In this way, the exhaust gas produced by the engine can enter the intake passage 24 through the first passage 11 and the second passage 21 in the cylinder head 2 and the cylinder head cover 1 and return to the combustion chamber for combustion, so as to realize crankcase ventilation.

As shown in Figure 3, the first channel 11 includes a first transverse curved channel 111 and a first vertical curved channel 112 which communicate with each other, and the first transverse curved channel 111 and the first vertical curved channel 112 are both straight lines. Type of blind hole structure, and perpendicular to each other. One end of the first vertical curved channel 112 is connected to the oil-gas separator 12 , and the first transverse curved channel 111 is in communication with the second channel 21 .

As shown in Figures 2 and 4, the second channel 21 includes a second vertical curved channel 211, a second oblique curved channel 212, and a second transverse curved channel 213, which are sequentially connected from end to end, all of which are linear. Blind hole structure, and perpendicular to each other in the three-dimensional plane, the second vertical curved channel 211 runs vertically, the second oblique curved channel 212 runs obliquely, and the second transverse curved channel 213 runs horizontally. During processing, different sides of the cylinder head 2 can be directly processed by drilling technology. The opening positions of the second oblique curved channel 212 and the second transverse curved channel 213 are sealed by the sealing structure, so that the gas can pass through smoothly and prevent gas leakage, wherein the second transverse curved channel 213 opens through The sealing steel ball 213a is sealed. The sealing steel ball 213a is in the shape of a sphere, and its diameter is slightly larger than that of the second transverse curved passage 213. It is pressed into the second transverse curved passage 213 by a pressing device, so that the sealing effect is better and the processing efficiency is high.

As shown in FIG. 4 and FIG. 5 , when the cylinder head cover 1 is installed on the cylinder head 2 , the second vertical curved passage 211 communicates with the first transverse curved passage 111 . The gas enters from the second vertical curved channel 211 into the second oblique curved channel 212 , and finally reaches the second transverse curved channel 213 . The cylinder head 2 is provided with an air guide passage 214 communicating with the second transverse curved passage 213 and the intake passage 24. The number of the air guide passage 214 and the intake passage 24 is the same and one-to-one correspondence, and the air guide passage 214 is along the first The two transverse curved passages 213 are evenly arranged in a straight line with a consistent distance between them, so that the gas in the second transverse curved passage 213 can evenly enter each air inlet 24 .

In this way, the entire small-load tortuous passage is completely integrated inside the cylinder head 2 assembly, and the risk of freezing of the small-load tortuous passage in winter is completely avoided through the high-temperature heat conduction of the cylinder head 2 during operation. Moreover, compared with the external small-load channel pipeline, the utility model reduces the number of parts, lowers the cost, and improves the working reliability of the engine.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

11, the first channel; 111, the first transverse curved channel; 112, the first vertical curved channel; 12, the oil-gas separator; 121, the small oil-gas separator Load channel; 2, cylinder head; 21, second channel; 211, second vertical curved channel; 212, second oblique curved channel; 213, second transverse curved channel; 213a, sealed steel ball; 214, 23. intake manifold; 24. terminology such as intake duct, but the possibility of using other terms is not excluded. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is contrary to the spirit of the utility model.

Claims (6)

1. a kind of crankcase ventilation structure, crankcase includes the valve mechanism cover (1) of cylinder head (2), setting in cylinder head (2), The gs-oil separator (12) for receiving combustion chamber, crankcase waste gas, the cylinder head are provided on the valve mechanism cover (1) (2) it is provided on for the inlet manifold (23) toward engine gas supply, the cylinder head (2) is interior to be provided with connection inlet manifold (23) with the air intake duct of combustion chamber (24), which is characterized in that aeration structure include setting in the valve mechanism cover (1) and with oil The first passage (11) of gas separating device (12) gas outlet connection, aeration structure further include have setting in the cylinder head (2) and with into The second channel (21) of air flue (24) connection, the first passage (11) are interconnected with second channel (21).

2. crankcase ventilation structure according to claim 1, which is characterized in that the first passage (11) includes mutually interconnecting Logical first lateral triton channel (111) and the first vertical triton channel (112), the first vertical triton channel (112) and Gs-oil separator (12) gas outlet is connected to, and the described first lateral triton channel (111) is connected to second channel (21) and connectivity points On the contact surface of valve mechanism cover (1) and cylinder head (2).

3. crankcase ventilation structure according to claim 1, which is characterized in that the second channel (21) include head and the tail according to The the second vertical triton channel (211) and the second oblique triton channel (212) of secondary connection and the second lateral triton channel (213), and Three is linear blind pipe structure, and the second vertical triton channel (211) is connected to first passage (11), and described second It is provided between lateral triton channel (213) and air intake duct (24) for interconnected air guide channel (214).

4. crankcase ventilation structure according to claim 3, which is characterized in that the number of air intake duct (24) in the cylinder head Amount is identical with number of combustion chambers and one-to-one correspondence, the quantity of the air guide channel (214) are identical as air intake duct (24) quantity and one One corresponds to.

5. crankcase ventilation structure according to claim 4, which is characterized in that two neighboring air guide channel (214) and the Interval all same between the communication port of two lateral triton channels (213).

6. crankcase ventilation structure according to claim 1, which is characterized in that the valve mechanism cover (1) and cylinder head (2) Contact surface be plane.