Design for arranging crankshaft shaft box ventilating duct on exhaust side of engine cylinder body
By arranging ventilation ducts on the exhaust side of the engine block and utilizing the heat from the cylinder block and exhaust pipe, the problem of ventilation duct icing in diesel engines in cold regions has been solved, achieving an anti-icing effect for the ventilation ducts, simplifying the structure, and reducing costs.
Patent Information
- Application Number
- CN202610001520.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-04
- Publication Date
- 2026-02-13
AI Technical Summary
In cold regions, existing diesel engine crankshaft ventilation box systems are prone to icing, which can lead to blockage of the ventilation ducts and cause engine malfunctions such as leaks, unstable idling, and difficulty starting. Existing anti-icing methods are complex in structure, costly, or may damage the turbocharger.
The crankshaft housing ventilation duct is located on the exhaust side of the engine block. The air inside the exhaust passage is heated by the temperature rise of the cylinder block and the thermal radiation from the exhaust pipe. Combined with the heating effect of the cylinder block cooling water jacket and oil passage, the air temperature inside the passage is increased to prevent icing.
It effectively prevents ventilation ducts from freezing, ensures unobstructed ventilation, avoids engine failure, simplifies the structure, and reduces costs.
Smart Images
Figure CN121520089A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of engine crankshaft axle box technology, and more particularly to a design for arranging the crankshaft axle box ventilation duct on the exhaust side of the engine block. Background Technology
[0002] In current open crankshaft ventilation system systems, after an engine stops in a cold region, the temperature of the ventilation opening begins to drop, and the air pressure inside the cavity becomes lower than outside. When outside air enters the ventilation opening, the water molecules in the air condense on the pipe wall because the temperature of the ventilation duct wall is lower than the temperature of the air inside the cavity. Then, the water droplets flow to the opening due to gravity, where they are cooled and frozen by the cold outside air, causing blockage or obstruction of the crankshaft ventilation box outlet. When the engine is restarted, the crankshaft box pressure is too high, leading to engine malfunctions such as leaks, unstable idling, and difficulty starting.
[0003] Currently, the anti-icing structures for the exhaust gas outlet pipe of the crankshaft ventilation box system of diesel engines in cold regions are as follows: the exhaust gas outlet pipe is placed close to the engine heat source such as the exhaust pipe and turbocharger; the exhaust gas outlet pipe is heated by a heater; and a closed structure is used to connect the exhaust gas to the intake system.
[0004] However, the above-mentioned anti-icing methods all have the following drawbacks: The method of placing the exhaust pipe close to the diesel engine heat source to eliminate icing will cause the rubber exhaust pipe to age, because the diesel engine heat source exhaust pipe and turbocharger are located on the upper part of the engine block, while the exhaust pipe outlet is located on the lower part of the diesel engine. Therefore, this method results in slower icing removal at the exhaust outlet. Heating the exhaust pipe with a heater is a complex and costly solution. A closed structure that connects the exhaust gas to the intake system requires extremely high control over the oil content of the exhaust gas; otherwise, it will damage the turbocharger. Summary of the Invention
[0005] Purpose of the invention: The purpose of this invention is to provide a design in which the crankshaft housing ventilation duct is arranged on the exhaust side of the engine block, so as to solve the above-mentioned shortcomings in the prior art.
[0006] Technical solution: A design for arranging a crankshaft case ventilation duct on the exhaust side of an engine block, comprising a cylinder block and an exhaust passage opened inside one side of the cylinder block, wherein the two ends of the exhaust passage are an exhaust gas inlet and an exhaust gas outlet, respectively, the exhaust gas inlet is connected to the engine crankshaft case, the exhaust gas outlet is located on one side of the cylinder block and is connected to the outside, and an engine exhaust pipe is also provided on the cylinder block, with the exhaust passage opened on one side of the engine exhaust pipe.
[0007] As a further description of the above technical solution: the exhaust passage is provided through the cylinder cooling water jacket and oil passage. Beneficial effects
[0008] 1. By placing the crankcase exhaust passage inside the cylinder block, the engine's temperature rise after starting accelerates the melting of ice in the exhaust passage, and the heat radiation emitted by the engine exhaust pipe can also heat the air in the exhaust passage.
[0009] 2. After the engine starts, the increased temperature of the coolant in the cylinder block cooling water jacket and the lubricating oil in the oil passage will further accelerate the rise in air temperature in the exhaust passage. Attached Figure Description
[0010] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a side view of the structure of the present invention.
[0011] Legend: 1. Exhaust passage; 101. Exhaust gas inlet; 102. Exhaust gas outlet; 2. Cylinder block; 3. Cylinder block cooling water jacket; 4. Oil passage; 5. Engine exhaust pipe; 6. Exhaust gas flow direction. Detailed Implementation
[0012] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0013] Reference Figure 1-2 A design for a crankshaft ventilation duct arranged on the exhaust side of an engine block includes a cylinder block 2 and an exhaust passage 1 located inside the cylinder block 2. The two ends of the exhaust passage 1 are an exhaust gas inlet 101 and an exhaust gas outlet 102, respectively. The exhaust gas inlet 101 is connected to the engine crankshaft ventilation box system, and the exhaust gas outlet 102 is located on one side of the cylinder block 2 and connected to the outside. An engine exhaust pipe 5 is also provided on the cylinder block 2, and the exhaust passage 1 is located on one side of the engine exhaust pipe 5. After the engine starts, the temperature rise of the cylinder block 2 will accelerate the rise of the air temperature in the exhaust passage 1. At the same time, since the exhaust passage 1 is located on the side of the engine exhaust pipe 5, the heat radiation emitted by the engine exhaust pipe 5 can also heat the air in the exhaust passage 1. In this way, by utilizing the heat of the engine itself, the ice generated at the exhaust gas outlet 102 of the exhaust passage 1 will melt faster, ensuring smooth airflow from the crankshaft ventilation box.
[0014] As a preferred technical solution in this embodiment, the exhaust passage 1 is provided through the cooling water jacket of the cylinder block 2 and the oil passage 4; after the engine starts, the temperature rise of the cooling water in the cooling water jacket of the cylinder block 2 and the lubricating oil in the oil passage 4 will further accelerate the rise of the air temperature in the exhaust passage.
[0015] The main purpose of the aforementioned engine crankshaft ventilation box system is to treat and reuse leaked gases in the engine crankshaft box; The aforementioned cylinder block 2 cooling water jacket structure is a series of interconnected cavities and channels cast inside the engine cylinder block 2 and cylinder head, surrounding the cylinder. These cavities are used to fill and circulate coolant, and their fundamental purpose is to carry away the huge heat generated by engine combustion and prevent engine overheating and damage. The engine crankshaft ventilation box system and cylinder block 2 cooling water jacket structure are existing technologies and therefore will not be described in detail.
[0016] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.
Claims
1. A design for arranging a crankshaft housing ventilation duct on the exhaust side of an engine block, comprising a cylinder block (2), wherein an engine exhaust pipe (5) is provided on the cylinder block (2), characterized in that, The exhaust passage (1) is located inside the cylinder block (2) on one side near the engine exhaust pipe (5). The two ends of the exhaust passage (1) are an exhaust gas inlet (101) and an exhaust gas outlet (102), respectively. The exhaust gas inlet (101) is connected to the engine crankcase, and the exhaust gas outlet (102) is located on one side of the cylinder block (2) and connected to the outside.
2. The design of the crankshaft housing ventilation duct arranged on the exhaust side of the engine block according to claim 1, characterized in that, The exhaust passage (1) is provided through the cylinder block (2), cooling water jacket, and oil passage (4).