Hidden curved through structure of engine
By incorporating a hidden bend structure with built-in oil and gas passages in the engine, the engine heat is used to prevent the bend system from icing, thus solving the icing problem during low-speed, low-load operation in cold regions and achieving a cost-effective anti-icing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-03-24
AI Technical Summary
Engine throttling systems are prone to icing failures when operating at low speeds and low loads for extended periods in cold regions. Existing anti-icing measures are costly and have limited effectiveness.
A hidden curved passage structure for engines is designed. By integrating the oil and gas passages into the cylinder head and cylinder head cover, the heat generated by the engine operation is used to insulate and heat the oil and gas passages, reducing the need for external piping and increasing the temperature of the oil and gas passages to prevent icing.
It effectively reduces the risk of icing in the crankshaft ventilation system pipes, reduces additional costs associated with anti-icing measures, and fully utilizes the engine's own heat to maintain the channel temperature and prevent icing.
Smart Images
Figure CN121719628A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of crankshaft ventilation system technology, and in particular to a concealed crankshaft ventilation structure for engines. 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 very 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, especially protruding parts such as pipes or valve bodies. Common anti-icing measures include pipe insulation, electric heating, and water heating; these are all passive anti-icing measures and require cost. Some pipes are 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 objective of this invention is to propose a compact engine concealed crankshaft ventilation system structure that reduces the layout of crankshaft ventilation system pipes and lowers the risk of pipe icing.
[0006] Therefore, this invention proposes a hidden crankcase structure for engines.
[0007] Preferably, the present invention may also have the following technical features:
[0008] An engine concealed curved structure includes a cylinder head and a cylinder head cover. The cylinder head cover is mounted on the cylinder head and has a pre-filter oil-gas separator built into it. The rear end of the cylinder head cover also integrates a first air guide chamber. The upper end of the first air guide chamber is connected to the air outlet of the pre-filter oil-gas separator. The rear end of the cylinder head integrates a second air guide chamber. The second air guide chamber and the first air guide chamber are positioned correspondingly, so that the oil and gas from the pre-filter oil-gas separator enter the second air guide chamber after passing through the first air guide chamber.
[0009] Furthermore, the pre-filtered oil-gas separator is installed inside the rear end of the cylinder head cover. It is equipped with an oil-gas inlet, a filter device, an oil return port, and an oil-gas outlet. After passing through the filter device, the oil-gas flows out from the oil-gas outlet and then enters the first air guide chamber and the second air guide chamber in sequence through the air delivery hole.
[0010] Furthermore, the upper part of the cylinder head cover is provided with the air supply hole, and the two ends of the air supply hole are respectively connected to the oil and gas outlet and the upper part of the first air guide chamber.
[0011] Furthermore, it also includes a cylinder block body and a gear chamber cover. The gear chamber cover is bolted to the rear end face of the engine body and has an air guide groove. The upper end of the air guide groove extends to the top surface of the gear chamber cover and forms an inlet. The top surface of the gear chamber cover and the bottom surface of the cylinder head are joined. The upper inlet of the air guide groove corresponds to the position of the second air guide chamber.
[0012] Furthermore, the air guide groove is a multi-bending groove.
[0013] Furthermore, the air guide groove is an air guide hole cast into the gear chamber cover, and the upper inlet of the air guide hole extends to the upper end face of the gear chamber cover.
[0014] 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.
[0015] Furthermore, the rear end of the cylinder body is cast with an exhaust chamber, the lower part of which is provided with an oil return port, the middle part with a first exhaust port, and the upper port is located on the rear end face of the cylinder body and communicates with the air guide groove.
[0016] Furthermore, the oil return port is connected 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.
[0017] Furthermore, the exhaust chamber is located at the lower part of the cylinder block body and is located at an intersection with the oil passage of the cylinder block body.
[0018] The beneficial effects of this invention compared to existing technologies include: By integrating the crankshaft ventilation system's oil-gas passages into the cylinder head cover and cylinder head, the need for external piping is reduced, allowing full utilization of the heat generated during engine operation to increase the temperature of the oil-gas passages and prevent icing. Since the cylinder head generates a large amount of heat during operation, integrating a second air guide chamber into the cylinder head allows for the use of a cylinder head water jacket to insulate and heat the second air guide chamber. Attached Figure Description
[0019] Figure 1 This is a partial cross-sectional view of the present invention.
[0020] Figure 2 This is a structural diagram of the arrangement of the first and second air guide chambers of the present invention.
[0021] Figure 3 This is a structural diagram of the present invention.
[0022] Figure 4 This is an assembly drawing of the gear chamber cover and cylinder head of the present invention.
[0023] Figure 5 This is a structural diagram of the air outlet chamber and air guide groove of the present invention.
[0024] Figure 6 This is a structural diagram of the air outlet chamber of the present invention. Detailed Implementation
[0025] 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.
[0026] 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.
[0027] like Figure 1-6 The illustrated engine concealed crankshaft ventilation structure includes a cylinder head 2 and a cylinder head cover 4. The cylinder head cover 4 is mounted on the cylinder head 2 and houses a pre-filter oil-gas separator. As an improvement, the rear end of the cylinder head cover 4 also integrates a first air guide chamber 41. The upper end of the first air guide chamber 41 is connected to the outlet of the pre-filter oil-gas separator. The rear end of the cylinder head 2 integrates a second air guide chamber 21. The second air guide chamber 21 and the first air guide chamber 41 are positioned correspondingly, allowing the oil and gas from the pre-filter oil-gas separator to enter the second air guide chamber 21 after passing through the first air guide chamber 41. The built-in crankshaft ventilation system's oil and gas passages on the cylinder head cover 4 and cylinder head 2 reduce the need for external piping and can fully utilize the heat generated during engine operation to increase the temperature of the oil and gas passages, preventing icing. Specifically, the cylinder head 2 generates a large amount of heat during operation. Integrating the second air guide chamber 21 on the cylinder head 2 allows for the use of a water jacket on the cylinder head 2 to insulate and heat the second air guide chamber 21.
[0028] The pre-filter oil-gas separator is installed inside the rear end of the cylinder head cover 4. It has an oil-gas inlet 45, a filter device 44, an oil return port 43, and an oil-gas outlet. Oil and gas enter the filter device 44 through the oil-gas inlet 45. The multi-stage filter device 44 improves the separation efficiency. After passing through the filter device 44, the oil and gas flows out from the oil-gas outlet, and then enters the first air guide chamber 41 and the second air guide chamber 21 in sequence through the air inlet 42. Preferably, the upper part of the cylinder head cover 4 has the air inlet 42, and the two ends of the air inlet 42 are respectively connected to the oil-gas outlet and the upper part of the first air guide chamber 41.
[0029] In a preferred embodiment, the cylinder body 1 and gear chamber cover 3 are further included, the gear chamber cover 3 being installed at the rear end of the cylinder body 1.
[0030] The cylinder block 1 has a main oil passage and a secondary oil passage 15 on its upper and lower parts on one side (e.g., the intake side). To reduce the risk of icing in the crankcase ventilation system's exhaust pipe, part of the exhaust pipe is integrated into the cylinder block 1. For example, an exhaust chamber 11 is cast at the rear end of the cylinder block 1. The lower part of the exhaust chamber 11 has an oil return port, the middle part has a first exhaust port 12, and the upper port is located on the rear end face of the cylinder block 1 (i.e., the surface where the cylinder block 1 and the gear chamber cover 3 meet). The oil return port connects to the inside of the crankcase or returns oil to the oil pan. This embodiment illustrates a scheme where the oil return port connects to the inside of the crankcase, and a one-way valve 13 is installed inside the oil return port to prevent oil and gas from the crankcase from entering the exhaust chamber 11. Preferably, the exhaust chamber 11 is located at the lower part of the cylinder block 1 and is staggered with the secondary oil passage 15. This design creates an arc-shaped, bent structure in the exhaust chamber 11, increasing the frequency of collisions between the oil and gas and the walls of the exhaust chamber 11, further separating the oil and gas. The oil separated from the exhaust chamber 11 flows along the walls of the exhaust chamber 11 to the bottom. 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 readily available product.
[0031] 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, 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 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 oil and gas from the first exhaust port 12 are discharged into the atmosphere or transported to an external oil-gas separator for further separation.
[0032] 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. 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 is joined to the bottom surface of the cylinder head 2. The upper inlet of the air guide groove 31 corresponds to the position of the second air guide chamber 21. Oil and gas enter the air guide groove 31 through the second air guide chamber 21 and then enter the exhaust chamber 11. Preferably, the air guide groove 31 is a multi-bending groove, meaning that during the process of oil and gas entering the air guide groove 31 from the upper inlet to flowing out from the lower outlet, the flow direction of the oil and gas is affected by the structure of the air guide groove 31 and changes direction multiple times. This increases the frequency of physical contact and improves 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. The upper inlet of the air guide groove 31 is located within the enclosure of the sealing groove.
[0033] In one embodiment of the above-mentioned air guide groove 31, 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.
[0034] In another embodiment of the air guide groove 31, 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 3 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 oil and gas are introduced from the upper part of the air guide groove 31 into the exhaust chamber 11.
[0035] 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 cylinder head cover 4, cylinder head 2, gear chamber cover 3 and cylinder block body 1. There is no need to arrange additional oil and gas pipelines on the cylinder block, reducing 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.
[0036] 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.
[0037] 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 concealed crankcase structure for an engine, comprising a cylinder head and a cylinder head cover, wherein the cylinder head cover is mounted on the cylinder head and has a built-in pre-filter oil-gas separator, characterized in that: The cylinder head cover also integrates a first air guide chamber at its rear end. The upper end of the first air guide chamber is connected to the air outlet of the pre-filter oil-gas separator. The cylinder head also integrates a second air guide chamber at its rear end. The second air guide chamber and the first air guide chamber are positioned correspondingly, so that the oil and gas from the pre-filter oil-gas separator enter the second air guide chamber after passing through the first air guide chamber.
2. The engine concealed curved passage structure as described in claim 1, characterized in that: The pre-filtered oil-gas separator is installed inside the rear end of the cylinder head cover. It is equipped with an oil-gas inlet, a filter device, an oil return port, and an oil-gas outlet. After passing through the filter device, the oil-gas flows out from the oil-gas outlet and then enters the first air guide chamber and the second air guide chamber in sequence through the air delivery hole.
3. The engine concealed curved passage structure as described in claim 1, characterized in that: The cylinder head cover has an air inlet at its upper part, and the two ends of the air inlet are respectively connected to the oil and gas outlet and the upper part of the first air guide chamber.
4. The engine concealed curved passage structure as described in claim 1, characterized in that: It also includes a cylinder block body and a gear chamber cover. The gear chamber cover is bolted to the rear end face of the engine body and has an air guide groove. The upper end of the air guide groove extends to the top surface of the gear chamber cover and forms an inlet. The top surface of the gear chamber cover and the bottom surface of the cylinder head are joined. The upper inlet of the air guide groove corresponds to the position of the second air guide chamber.
5. The engine concealed curved passage structure as described in claim 4, characterized in that: The air guide groove is a multi-bending groove.
6. The engine concealed curved passage structure as described in claim 4, characterized in that: The air guide groove is an air guide hole cast into the gear chamber cover, and the upper inlet of the air guide hole extends to the upper end face of the gear chamber cover.
7. The engine concealed curved passage structure as described in claim 4, characterized in that: 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.
8. The engine concealed curved passage structure as described in claim 4, characterized in that: The cylinder block body has a cast air outlet chamber at the rear end. The lower part of the air outlet chamber is provided with an oil return port, the middle part is provided with a first air outlet, and the upper port is located on the rear end face of the cylinder block body and communicates with the air guide groove.
9. The engine concealed curved passage structure as described in claim 8, characterized in that: 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.
10. The engine concealed curved passage structure as described in claim 8, characterized in that: The exhaust chamber is located at the lower part of the cylinder block body and is located at an intersection with the oil passage of the cylinder block body.