A closed crankcase ventilation system

Abstract

The utility model discloses a closed crankcase ventilation system, including cylinder block, oil gas separator and oil cooler seat, the exhaust side of cylinder block is equipped with oil gas separator and oil cooler seat, the cylinder block still is equipped with the gas inlet, the oil gas passage of oil cooler seat integration, one end of oil gas passage is connected the gas inlet, and the other end is connected oil gas pipeline, the other end of oil gas pipeline is connected the gas inlet of oil gas separator. The utility model has the advantages of compact structure, shortens crankcase build pressure time etc.

Description

Technical Field

[0001] This utility model relates to the technical field of crankcase ventilation systems, and in particular to a closed crankcase ventilation system. Background Technology

[0002] During engine operation, due to the gap between the piston rings and the cylinder wall, some gas inevitably leaks from the combustion chamber into the engine crankcase. If this gas is not removed, the gas pressure inside the engine will gradually increase, leading to oil seal damage and subsequent crankcase gas leakage, thus polluting the environment.

[0003] The crankcase ventilation system of existing engines generally has crankcase blow-by passages on the cylinder block and cylinder head. Gases in the crankcase enter the cylinder head cover through the blow-by passages. Inside the cylinder head cover is an oil-gas separator, which separates the engine oil from these gases. The remaining gases are then guided into the intake manifold through a breather ventilation hose located outside the cylinder, allowing them to enter the cylinder and be burned along with the gases in the intake manifold.

[0004] The intake pipe of the external oil-gas separator draws air from the cylinder head cover. The intake pipe is relatively long, and the time it takes for oil and gas to flow from the cylinder head cover to the external oil-gas separator is long, resulting in a longer time to establish negative pressure in the crankcase.

[0005] Existing patent document CN107524494A discloses an engine crankcase ventilation system, which introduces the gas separated by the oil-gas separator into the intake manifold through the exhaust channel set on the cylinder head, and finally allows the gas to enter the cylinder of the cylinder block. This effectively eliminates the need for the breather ventilation hose in the prior art and solves the problem that the gas in the breather ventilation hose is prone to freezing and clogging when it gets cold.

[0006] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0007] The main purpose of this utility model is to propose a closed crankcase ventilation system with a simple structure, which reduces the length of the oil-gas pipeline entering the oil-gas separator and shortens the crankcase pressure build-up time.

[0008] Therefore, this utility model proposes a closed crankcase ventilation system.

[0009] Preferably, the present invention may also have the following technical features:

[0010] A closed crankcase ventilation system includes a cylinder block, an oil-gas separator, and an oil cooler housing. The oil-gas separator and the oil cooler housing are located on the exhaust side of the cylinder block. The cylinder block also has an air intake port. The oil cooler housing integrates an oil-gas passage. One end of the oil-gas passage is connected to the air intake port, and the other end is connected to an oil-gas pipeline. The other end of the oil-gas pipeline is connected to the air intake port of the oil-gas separator.

[0011] Furthermore, the oil cooler housing is installed at the upper right corner of the cylinder block, and the oil-gas separator is installed at the lower left corner of the oil cooler housing.

[0012] Furthermore, the air intake port is located 170-280mm from the top surface of the cylinder block.

[0013] Furthermore, the oil and gas channel includes a longitudinal channel and a transverse channel, which are connected to form an L-shaped channel structure. One end of the transverse channel is connected to the gas intake port, and the other end is connected to the longitudinal channel.

[0014] Furthermore, the other end of the longitudinal channel is provided with an oil-gas connector, which is connected to the oil-gas pipeline.

[0015] Furthermore, the oil-gas connector is perpendicular to the longitudinal channel.

[0016] Furthermore, an oil collection trough is provided at the junction of the transverse channel and the longitudinal channel. The oil collection trough is used to collect oil that impacts the oil and gas channel, and the bottom of the trough is lower than the lowest point of the transverse channel.

[0017] Furthermore, it also includes an oil return pipe, the upper end of which is connected to the oil collection groove, and the lower end of which is connected to the lower part of the cylinder block.

[0018] Furthermore, the distance between the lowest point of the longitudinal channel and the lowest point of the transverse channel is 3-8 mm.

[0019] The beneficial effects of this invention compared to existing technologies include: drawing gas from the closed crankcase via the oil cooler results in a shorter pipeline path compared to drawing gas from the cylinder head cover, and a shorter oil-gas separator operation time (time to establish negative pressure in the crankcase). The oil cooler has heat exchange characteristics, radiating heat to the oil-gas passage and increasing the oil-gas temperature. The L-shaped oil-gas passage arrangement ensures that during oil-gas transport, oil adheres to the passage walls when the oil-gas collides with and reverses direction, resulting in physical separation of oil and gas. Attached Figure Description

[0020] Figure 1 and Figure 2 This is a cross-sectional view of the present invention.

[0021] Figure 3 and Figure 4 This is the front view of this utility model.

[0022] Figure 5 This is a structural diagram of the oil cooler seat of this utility model. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0024] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0025] like Figure 1-5 The illustrated closed crankcase ventilation system includes a cylinder block 1, an oil-gas separator 4, and an oil cooler seat 2. The oil-gas separator 4 and oil cooler seat 2 are located on the exhaust side of the cylinder block 1. The oil cooler seat 2 is installed at the upper right corner of the cylinder block 1, and the oil-gas separator 4 is installed at the lower left corner of the oil cooler seat 2. As an improvement, the cylinder block 1 also has an air intake port 12. The oil cooler seat 2 integrates an oil-gas passage. One end of the oil-gas passage is connected to the air intake port 12, and the other end is connected to an oil-gas pipeline 3. The other end of the oil-gas pipeline 3 is connected to the air intake port of the oil-gas separator 4. In this embodiment, drawing gas from the closed crankcase 11 via the oil cooler results in a shorter pipeline path compared to drawing gas from the cylinder head cover, and the oil-gas separator 4 operates for a shorter time (time to establish negative pressure in the crankcase). The oil cooler has heat exchange characteristics and radiates heat to the oil-gas passage, increasing the temperature of the oil and gas.

[0026] In a preferred embodiment, the air intake 12 is located in a position with less oil mist distribution, for example, avoiding the oil splashing range of the engine's moving parts. Generally, engine oil is dispersed into oil mist by high-speed impacts from the moving parts within the crankcase 11, causing some areas within the crankcase 11 to be directly radiated by the oil mist, resulting in a relatively high oil mist concentration compared to other areas, while other areas have a relatively low oil mist concentration. Preferably, the air intake 12 is located 170-280 mm, more preferably 190-220 mm, from the top surface of the cylinder block 1, where there is relatively less oil mist.

[0027] Preferably, the oil and gas channel includes a longitudinal channel 21 and a transverse channel 23, which are connected to form an L-shaped channel structure. One end of the transverse channel 23 is connected to the gas intake 12, and the other end is connected to the longitudinal channel 21. An oil and gas connector 22 is provided at the other end of the longitudinal channel 21, and the oil and gas connector 22 is connected to the oil and gas pipeline 3. With the L-shaped arrangement of the oil and gas channel, during the oil and gas transportation process, when the oil and gas collide and change direction within the channel, the oil in the oil and gas adheres to the channel wall, forming a physical separation of oil and gas. Preferably, the oil and gas connector 22 is perpendicular to the longitudinal channel 21, further increasing the number of oil and gas reversals and improving the oil and gas separation effect.

[0028] A further optimization of the above scheme involves providing an oil collection groove 24 at the junction of the transverse channel 23 and the longitudinal channel 21. The oil collection groove 24 collects engine oil impacted by oil vapor in the oil-gas passage. Preferably, the bottom of the oil collection groove 24 is lower than the lowest point of the transverse channel 23. An oil return pipe 6 is also included. The upper end of the oil return pipe 6 connects to the oil collection groove 24, and the lower end connects to the lower part of the cylinder block 1, introducing the engine oil from the oil collection groove 24 into the crankcase 11 and flowing back to the oil pan. For example, when the transverse channel 23 and the longitudinal channel 21 are combined, there is a certain distance between the lowest point of the longitudinal channel 21 and the lowest point of the transverse channel 23, such as 3-8 mm. This allows the oil collection groove 24 to be formed from the lower end face of the longitudinal channel 21 to the lowest point of the transverse channel 23. This structural design is simple and easy to implement. Then, a hole is drilled in the lower end face of the longitudinal channel 21 and a connector is connected, and the upper end of the oil return pipe 6 is connected to the connector. An oil return structure is added to the oil cooler to assist in oil return when the engine is tilted to the right, adapting to harsh operating scenarios with inclined roads.

[0029] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0030] Although exemplary embodiments of the present invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the present invention.

Claims

1. A closed crankcase ventilation system, comprising a cylinder block, an oil-gas separator, and an oil cooler housing, wherein the oil-gas separator and the oil cooler housing are disposed on the exhaust side of the cylinder block, characterized in that: The cylinder block is also provided with an air intake port, and the oil cooler seat integrates an oil-gas passage. One end of the oil-gas passage is connected to the air intake port, and the other end is connected to an oil-gas pipeline. The other end of the oil-gas pipeline is connected to the air inlet of the oil-gas separator.

2. The closed crankcase ventilation system as described in claim 1, characterized in that: The oil cooler housing is installed at the upper right corner of the cylinder block, and the oil-gas separator is installed at the lower left corner of the oil cooler housing.

3. The closed crankcase ventilation system as described in claim 1, characterized in that: The air intake port is located 170-280mm from the top surface of the cylinder block.

4. The closed crankcase ventilation system as described in claim 1, characterized in that: The oil and gas channel includes a longitudinal channel and a transverse channel, which are connected to form an L-shaped channel structure. One end of the transverse channel is connected to the gas intake port, and the other end is connected to the longitudinal channel.

5. The closed crankcase ventilation system as described in claim 4, characterized in that: The other end of the longitudinal channel is provided with an oil-gas connector, which is connected to the oil-gas pipeline.

6. The closed crankcase ventilation system as described in claim 5, characterized in that: The oil and gas connector is perpendicular to the longitudinal channel.

7. The closed crankcase ventilation system as described in claim 4, characterized in that: An oil collection trough is provided at the junction of the transverse and longitudinal channels. The oil collection trough is used to collect oil that impacts the oil and gas channels. The bottom of the trough is lower than the lowest point of the transverse channel.

8. The closed crankcase ventilation system as described in claim 7, characterized in that: It also includes an oil return pipe, the upper end of which is connected to the oil collection groove, and the lower end of which is connected to the lower part of the cylinder block.

9. The closed crankcase ventilation system as described in claim 7, characterized in that: The distance between the lowest point of the longitudinal channel and the lowest point of the transverse channel is 3-8 mm.

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