Cylinder body of hidden engine bent through structure

Abstract

The invention discloses a cylinder block of a hidden engine curved through structure, which comprises a cylinder block body and a gear chamber cover arranged at the rear end of the cylinder block body, and is characterized in that an air outlet cavity is arranged at the rear end of the cylinder block body, an oil return port is arranged at the lower part of the air outlet cavity, and a first air outlet is arranged in the middle of the air outlet cavity; the upper port is located in the rear end face of the cylinder block body, the oil return port is communicated with the interior of a crankcase or returns oil into an oil pan, and a one-way valve is arranged in the oil return port. The device has the advantages of compact structure, reduction of pipeline arrangement of a crankshaft ventilation system, reduction of pipeline icing risk and the like.

Description

Technical Field

[0001] This invention relates to the field of crankcase ventilation system technology, and in particular to a cylinder block with a concealed engine crankcase ventilation structure. Background Technology

[0002] Engines have a wide range of applications and require operation in various scenarios. High-temperature, high-altitude, and extremely cold environments place extremely demanding requirements on engines. Besides these different scenarios, there are also varying operational requirements, such as prolonged low-speed, low-load operation, frequent start-stop cycles, and continuous high-speed, high-load operation. For the engine's cooling system, icing is particularly prone to occur in extremely cold regions under prolonged low-speed, low-load operation. Icing often occurs in external, low-temperature areas, such as external pipes or valve bodies, where icing is especially pronounced. Common anti-icing measures include pipe insulation, electric heating, and water heating. These are all passive anti-icing measures, requiring significant upfront and ongoing maintenance costs. Some pipes are also located on the exhaust side, utilizing the engine's own heat radiation to reduce the risk of icing.

[0003] Several key factors contribute to icing: low temperature, heat exchange area, and heat transfer. First, the low temperature originates from the environment; the heat exchange area depends on the area of ​​the pipes or valves exposed to the low-temperature environment; and heat transfer depends on the thermal conductivity of the pipe materials. Therefore, anti-icing measures can be implemented by altering these key factors.

[0004] The above background information is provided only to aid in understanding the concept and technical solution of this invention. 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. Summary of the Invention

[0005] The main purpose of this invention is to propose a concealed engine bend structure with no exposed bend pipes and valve bodies, thereby achieving the effect of preventing icing by reducing the contact area between the bend pipes and the cold environment.

[0006] Therefore, this invention proposes a cylinder block with a concealed engine through-hole structure.

[0007] Preferably, the present invention may also have the following technical features:

[0008] A cylinder block with a concealed engine crankcase structure includes a cylinder block body, a gear chamber cover at the rear end of the cylinder block body, an exhaust chamber at the rear end of the cylinder block body, an oil return port at the lower part of the exhaust chamber, a first exhaust port at the middle part, and an upper port located at the rear end face of the cylinder block body. The oil return port connects to the inside of the crankcase or returns oil to the oil pan, and a one-way valve is installed inside the oil return port.

[0009] Furthermore, the air outlet chamber has a bent structure.

[0010] Furthermore, the lowest end of the oil return port is located below the bottom surface of the air outlet chamber.

[0011] Furthermore, the oil return port is inclined, with its upper end connected to the air outlet chamber and its lower end facing the inside of the crankcase.

[0012] Furthermore, the exhaust chamber and the cylinder body are cast together, and there is a mold core-pulling hole at the bottom of the cylinder body, which is sealed with a screw plug.

[0013] Furthermore, the gear chamber cover is bolted to the rear end face of the engine body and has an air guide groove. The lower end of the air guide groove is connected to the air outlet chamber, and the upper end extends to the top surface of the gear chamber cover to form an inlet.

[0014] Furthermore, the air guide groove is a multi-bending groove.

[0015] Furthermore, a sealing groove is provided at the contact position between the gear chamber cover and the cylinder cover, and a sealing ring is installed in the sealing groove.

[0016] Furthermore, the air guide groove is an air guide hole cast into the gear chamber cover, the lower port of the air guide hole is aligned with the air outlet chamber, and the upper inlet extends to the upper end face of the gear chamber cover.

[0017] Furthermore, the gear chamber cover has an air guide groove on the side facing the cylinder body. After the gear chamber cover is installed on the cylinder body, the air guide groove and the rear end face of the cylinder body cooperate to form an air guide structure.

[0018] The beneficial effects of this invention compared with the prior art include: there are no external pipes on the cylinder block, all the through ventilation passages run inside the engine, effectively reducing the number of external pipes; the built-in hidden through ventilation passages can make full use of the engine's own heat to maintain a good temperature and avoid icing. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the present invention.

[0020] Figure 2 This is an assembly drawing of the gear chamber cover and cylinder head of the present invention.

[0021] Figure 3 This is a structural diagram of the air outlet chamber and air guide groove of the present invention.

[0022] Figure 4 This is a structural diagram of the air outlet chamber of the present invention. 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 or 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 1-4 The cylinder block shown is a concealed crankcase structure, including a cylinder block body 1. The rear end of the cylinder block body 1 is a gear chamber end with a gear chamber cover 3, and the front end is a pulley end. The upper and lower parts of one side (such as the intake side) of the cylinder block body 1 are respectively provided with a main oil passage and a secondary oil passage 15. To reduce the risk of icing of the exhaust pipe of the crankcase ventilation system, part of the exhaust pipe is integrated into the cylinder block body 1. For example, an exhaust chamber 11 is cast at the rear end of the cylinder block body 1. The lower part of the exhaust chamber 11 is provided with an oil return port, the middle part is provided with a first exhaust port 12, and the upper port is located at the rear end face of the cylinder block body 1 (i.e., the surface where the cylinder block body 1 and the gear chamber cover 3 are joined). The oil return port connects to the inside of the crankcase or returns oil to the oil pan. This embodiment illustrates a scheme in which the oil return port connects to the inside of the crankcase, and a one-way valve 13 is provided inside the oil return port to prevent oil and gas from the crankcase from entering the exhaust chamber. Preferably, the exhaust chamber 11 is located at the lower part of the cylinder block body 1 and is staggered with the auxiliary oil passage 15. This creates an arc-shaped, bent structure in the exhaust chamber 11, increasing the frequency of gas impact with the wall of the exhaust chamber 11, further separating the oil and gas. The oil separated from the exhaust chamber flows along the wall of the exhaust chamber 11 to the bottom of the exhaust chamber 11. Therefore, when setting the oil return port, the lowest point of the oil return port is located below the bottom surface of the exhaust chamber 11, allowing the engine oil accumulated in the exhaust chamber 11 to flow into the crankcase through the oil return port. Preferably, the one-way valve 13 is a disc-type one-way valve, a conventional product.

[0026] Specifically, the oil return port is inclined, with its upper end connected to the exhaust chamber 11 and its lower end facing the inside of the crankcase, causing the oil to flow downwards into the crankcase. Thus, when the amount of oil in the exhaust chamber 11 is sufficient and reaches the pressure required to open the one-way valve 13, the one-way valve 13 is opened, and the oil in the exhaust chamber 11 flows into the crankcase. Therefore, in designing the first exhaust port 12, the distance between the first exhaust port 12 and the oil return port is sufficient to ensure that the oil accumulated in the exhaust chamber 11 can reach the pressure required to open the one-way valve 13. Preferably, the exhaust chamber 11 and the cylinder block body 1 are cast together, and the bottom of the exhaust chamber 11 also has a mold core-pulling hole 14, which is sealed with a screw plug. When it is necessary to drain the oil from the exhaust chamber 11, the screw plug can be opened to drain the oil. The gas exiting the first exhaust port 12 is discharged into the atmosphere or transported to an external oil-gas separator for further separation.

[0027] The gear chamber cover 3 is bolted to the rear end face of the engine body 1. It has an air guide groove 31, the lower outlet of which connects to the upper port of the exhaust chamber 11, and the upper end extends to the top surface of the gear chamber cover 3, forming an inlet 32. The top surface of the gear chamber cover 3 and the bottom surface of the cylinder head 2 are joined. Preferably, the air guide groove 31 is a multi-bending groove, meaning that during the process of gas entering the air guide groove 31 from the upper inlet and flowing out from the lower outlet, the gas flow direction is affected by the structure of the air guide groove 31 and changes direction multiple times. This increases the frequency of physical contact, improving the oil-gas separation effect of the air guide groove 31. Preferably, a sealing groove is provided at the contact position between the gear chamber cover 3 and the cylinder head 2, and a sealing ring is installed in the sealing groove to enhance the sealing of the connection between the cylinder head 2 and the gear chamber cover 3. The upper inlet of the air guide groove 31 is located within the enclosure of the sealing groove.

[0028] In one embodiment of the above-mentioned air guide groove, the air guide groove 31 is an air guide hole cast on the gear chamber cover 3, the lower port of the air guide hole is aligned with the air outlet chamber 11, and the upper inlet extends to the upper end face of the gear chamber cover 3.

[0029] In another embodiment of the air guide groove 31, referring to the accompanying drawings of the present invention, the upper part of the gear chamber cover 3 is higher than the upper end face of the cylinder body 1. The air guide groove 31 is provided on the side of the gear chamber cover 3 facing the cylinder body 1. After the gear chamber cover 4 is installed on the cylinder body 1, the air guide groove 31 and the rear end face of the cylinder body 1 cooperate to form an air guide structure, so that the gas enters from the upper part of the air guide groove 31 and is introduced into the exhaust chamber 11.

[0030] In this way, the oil and gas separated by the pre-filter oil-gas separator enter the exhaust chamber 11 inside the cylinder block body 1 through the air guide groove 31 of the gear chamber cover 3. The oil and gas pipeline is integrated on the gear chamber cover 3 and the cylinder block body 1, eliminating the need for additional oil and gas pipelines on the cylinder block. This reduces the pipeline layout of the crankshaft ventilation system. The built-in hidden crankshaft ventilation channel can make full use of the engine's own heat to maintain a good temperature and avoid icing.

[0031] 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.

[0032] Although exemplary embodiments of the 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 invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the invention without departing from the central concepts of the invention described herein. Therefore, the invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the invention.

Claims

1. A cylinder block with a concealed engine through-type structure, comprising a cylinder block body, wherein a gear chamber cover is provided at the rear end of the cylinder block body, characterized in that: An exhaust chamber is provided at the rear end of the cylinder block body. The lower part of the exhaust chamber is provided with an oil return port, the middle part is provided with a first exhaust port, and the upper port is located at the rear end face of the cylinder block body. The oil return port is connected to the inside of the crankcase or returns oil to the oil pan. A one-way valve is provided inside the oil return port.

2. The cylinder block with the concealed engine through-type structure as described in claim 1, characterized in that: The air outlet chamber has a bent structure.

3. The cylinder block with the concealed engine through-type structure as described in claim 1, characterized in that: The lowest point of the oil return port is located below the bottom surface of the air outlet chamber.

4. The cylinder block with the concealed engine through-type structure as described in claim 1, characterized in that: The oil return port is inclined, with its upper end connected to the air outlet chamber and its lower end facing the inside of the crankcase.

5. The cylinder block with the concealed engine through-type structure as described in claim 1, characterized in that: The exhaust chamber and the cylinder body are cast together, and there is a mold core-pulling hole at the bottom of the cylinder body, which is sealed with a screw plug.

6. The cylinder block with the concealed engine through-type structure as described in claim 1, characterized in that: The gear chamber cover is bolted to the rear end face of the engine body. It is provided with an air guide groove. The lower end of the air guide groove is connected to the air outlet chamber, and the upper end extends to the top surface of the gear chamber cover to form an inlet.

7. The cylinder block with the concealed engine through-type structure as described in claim 6, characterized in that: The air guide groove is a multi-bending groove.

8. The cylinder block with the concealed engine through-type structure as described in claim 6, characterized in that: A sealing groove is provided at the contact position between the gear chamber cover and the cylinder head, and a sealing ring is installed in the sealing groove.

9. The cylinder block with the concealed engine through-type structure as described in claim 6, characterized in that: The air guide groove is an air guide hole cast into the gear chamber cover. The lower port of the air guide hole is aligned with the air outlet chamber, and the upper inlet extends to the upper end face of the gear chamber cover.

10. The cylinder block with the concealed engine through-type structure as described in claim 6, characterized in that: The gear chamber cover has the air guide groove on the side facing the cylinder body. After the gear chamber cover is installed on the cylinder body, the air guide groove and the rear end face of the cylinder body cooperate to form an air guide structure.

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