Air cooled diesel engine with oil internal and external circulation cooling

Abstract

This invention relates to the field of diesel engine technology, particularly to an air-cooled diesel engine with internal and external oil circulation cooling. It overcomes the problems of excessively high oil temperature in existing air-cooled diesel engines or the high cost and unreliability of added oil cooling devices. The engine comprises a block, gear chamber cover, crankshaft, flywheel, and oil pump. The crankshaft axis is aligned with the diesel engine axis. The block and gear chamber cover form the diesel engine cavity. A honeycomb cooling block is fixed to the bottom surface of the engine body. The honeycomb cooling block has several cooling through-holes aligned with the engine axis, allowing airflow from the flywheel to pass through. These through-holes are arranged horizontally at intervals. Each cooling through-hole on the honeycomb cooling block has an inlet communicating with the diesel engine cavity on its front side and an outlet leading to the oil pump on its rear side. The inlet is connected to the outlet via an undulating oil channel that winds around the outer wall of each cooling through-hole. The low-temperature air flowing through the cooling through-holes cools the high-temperature oil flowing through the oil channels outside the cooling through-hole walls.

Description

Technical Field

[0001] This invention relates to the field of diesel engine technology, and in particular to an air-cooled diesel engine with internal and external oil circulation cooling. Background Technology

[0002] Air-cooled diesel engines are filled with engine oil, which is then lubricated by the oil pump and rotating crankshaft to the bearings and pistons of moving parts within the engine. If the engine oil temperature is too high, the viscosity of the engine oil will drop excessively, which will affect the lubrication performance and may even cause cylinder scoring in severe cases. In order to reduce the temperature rise of the engine oil, most engines will improve the heat dissipation of the engine block, such as by setting up cooling fins on the engine block and increasing the volume of the oil sump. However, these methods are not very effective in cooling down the engine.

[0003] One effective cooling method involves drawing engine oil out of the engine block and connecting it to a copper coil before introducing it back into the engine block. The coil is fixed to the engine block in a position where it can be reached by the flywheel. The disadvantages of this structure are: 1. There are many pipe joints, and the pipe joints are the first to be damaged when the coil is subjected to force or impact; 2. It is difficult to reliably fix the copper coil outside the engine block, and it is easily deformed and damaged by impact; 3. The high cost of copper coils makes it difficult to promote the use of this structure in air-cooled diesel engines. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an air-cooled diesel engine with internal and external oil circulation cooling, which overcomes the problems of excessively high oil temperature in existing air-cooled diesel engines or the high cost and unreliability of the oil cooling devices installed.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an air-cooled diesel engine with internal and external oil circulation cooling, including an engine body, a gear chamber cover, a crankshaft, a flywheel and an oil pump. The axis of the crankshaft is the axis of the diesel engine. The engine body and the gear chamber cover form the inner cavity of the diesel engine. A honeycomb cooling block is fixed on the outer bottom surface of the engine body. The honeycomb cooling block has a plurality of cooling through holes in the same direction as the axis, allowing the airflow blown by the flywheel to flow through. The cooling through holes are arranged horizontally at intervals.

[0006] The honeycomb cooling block has a liquid inlet on the front side of the cooling through hole that communicates with the inner cavity of the diesel engine, and a liquid outlet on the rear side of the cooling through hole that leads to the oil pump. The liquid inlet is connected to the liquid outlet through an undulating, wave-shaped oil channel that winds around the outer wall of each cooling through hole.

[0007] The wall of the cooling through hole is made of a thermally conductive material, and the low-temperature air flowing through the cooling through hole cools the high-temperature engine oil flowing through the oil channel outside the cooling through hole wall.

[0008] In order to ensure smooth flow of engine oil in the inner cavity and oil passage, the engine body is provided with a vent bolt to balance the air pressure in the inner cavity and oil passage. The upper end of the vent bolt is located above the oil level, and the lower end is connected to the oil passage of the honeycomb cooling block.

[0009] Specifically, a structure that is easy to process is provided, wherein the outline of the honeycomb cooling block is rectangular, and the honeycomb cooling block is fixed to the bottom surface of the machine body by fixing bolts from its upper flange edge.

[0010] Specifically, the cross-sectional shape of the cooling through hole is rectangular, and the undulation shape of the oil channel is rectangular wave-like.

[0011] Specifically, the honeycomb cooling block is a single piece with an upper end face, the rectangular wavy oil channel has several upper flat sections, the outer bottom surface of the body also serves as the upper wall surface of the upper flat sections, a sealing gasket is provided between the upper end face and the outer bottom surface of the body, the sealing gasket is mesh-shaped, the mesh-shaped sealing gasket seals between the outer bottom surface of the body and the upper end face of the honeycomb cooling block and between each upper flat section.

[0012] Specifically, the structure of the outlet leading to the oil pump is as follows: it has an oil conduit, the upper end of which is screwed onto the bottom surface of the machine body and communicates with the axial oil hole inside the bottom wall of the machine body, and the lower end is inserted into the outlet. The inlet of the external oil pump is connected to the axial oil hole.

[0013] Specifically, the oil drain port of the diesel engine is located on the honeycomb cooling block, and the oil drain port is connected to the oil passage.

[0014] The beneficial effects of this invention are as follows: The air-cooled diesel engine with internal and external oil circulation cooling of this invention, with honeycomb cooling blocks set at the bottom of the engine block, has the following advantages: 1. The cooling device is not easily damaged by impact, the oil passage is more reliable without the use of pipe joints, and the large cross-sectional area of ​​the oil passage results in high cooling efficiency; 2. The oil passage undulates between the cooling holes, which can fully exchange heat with the cooling holes; 3. The honeycomb cooling blocks have low manufacturing cost; 4. It increases the oil sump volume of the diesel engine, or, with the same oil sump volume, the height of the shaft can be appropriately reduced, improving the stability of the diesel engine during installation and fixing. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is an exploded view of the body and the honeycomb cooling block in this invention;

[0017] Figure 2 This is a perspective view of the honeycomb cooling block in this invention;

[0018] Figure 3 This is a cross-sectional view of the honeycomb cooling block in this invention.

[0019] In the diagram, 1 represents the machine body, and 1-1 represents the axial oil hole.

[0020] 2. Inner cavity;

[0021] 3. Honeycomb cooling block, 3-1. Cooling through hole, 3-2. Liquid inlet, 3-3. Liquid outlet, 3-4. Oil channel, 3-4-1. Upper flat section, 3-5. Flange edge, 3-6. Upper end face, 3-7. Oil drain port;

[0022] 4. Vent bolt;

[0023] 5. Fixing bolts;

[0024] 6. Sealing gasket;

[0025] 7. Oil pipe. Detailed Implementation

[0026] The present invention will now be further described with reference to the accompanying drawings, which are simplified schematic diagrams illustrating only the basic structure of the invention and therefore only show the components relevant to the invention.

[0027] As attached Figure 1 An air-cooled diesel engine with internal and external oil circulation cooling is disclosed. The air-cooled diesel engine includes an engine block 1, a gear chamber cover, a crankshaft, a flywheel, and an oil pump. Since the innovation of this invention is not specifically targeted at the gear chamber cover, crankshaft, flywheel, and oil pump, the following is provided to clearly demonstrate the innovative aspects of this invention: Figure 1 The gear chamber cover, crankshaft, flywheel, and oil pump are not shown. The crankshaft's axis is aligned with the diesel engine's axis. The engine block 1 and gear chamber cover form the diesel engine's inner cavity 2. A honeycomb cooling block 3 is fixed to the outer bottom surface of the engine block 1. The structure of the honeycomb cooling block 3 is described in [reference needed]. Figure 2 3D diagram and Figure 3 The cross-sectional view shows that the honeycomb cooling block 3 has several cooling through holes 3-1 that are in the same direction as the diesel engine axis and allow the flywheel-driven airflow to pass through. The cooling through holes 3-1 are arranged horizontally at intervals, and the front and back directions are horizontal and perpendicular to the axis direction.

[0028] The honeycomb cooling block 3 has a liquid inlet 3-2 on the front side of the cooling through hole 3-1 that communicates with the inner cavity 2 of the diesel engine, and a liquid outlet 3-3 on the rear side of the cooling through hole 3-1 that leads to the oil pump. The liquid inlet 3-2 has an opening on the bottom wall of the engine body 1. Here, one side is defined as the front side and the other side as the rear side. In the attached figure, the left side is the front side. The liquid inlet 3-2 is connected to the liquid outlet 3-3 through the oil channel 3-4 that winds around the outer wall of each cooling through hole 3-1 in an undulating wave shape.

[0029] The wall of the cooling through hole 3-1 is made of a thermally conductive material. The low-temperature air flowing through the cooling through hole 3-1 cools the high-temperature engine oil flowing through the oil channel 3-4 outside the wall of the cooling through hole 3-1.

[0030] The honeycomb cooling block 3 has a rectangular outline and is fixed to the outer bottom surface of the body 1 by the flange edge 3-5 at its upper part via fixing bolts 5; the cross-sectional shape of the cooling through hole 3-1 is rectangular, and the undulating shape of the oil channel 3-4 is rectangular wave-shaped.

[0031] The honeycomb cooling block 3 is a single piece with an upper end face 3-6. The honeycomb cooling block 3 is a casting. The cooling through hole 3-1 and the oil channel 3-4 are formed by the mold core. The rectangular wave-shaped oil channel 3-4 has several upper flat sections 3-4-1. The outer bottom surface of the body 1 also serves as the upper wall surface of the upper flat section 3-4-1. A sealing gasket 6 is provided between the upper end face 3-6 and the outer bottom surface of the body 1. The sealing gasket 6 is mesh-shaped. The mesh-shaped sealing gasket 5 seals between the outer bottom surface of the body 1 and the upper end face 3-6 of the honeycomb cooling block 3 and seals between each upper flat section 3-4-1.

[0032] The structure of the outlet 3-3 leading to the oil pump is as follows: it has an oil conduit 7. The upper end of the oil conduit 7 is screwed onto the bottom surface of the body 1 and communicates with the axial oil hole 1-1 inside the bottom wall of the body 1. The lower end is inserted into the outlet 3-3. The outlet 3-3 is groove-shaped. The oil inlet of the oil pump outside the body 1 is communicated with the axial oil hole 1-1.

[0033] As attached Figure 1 The body 1 is provided with a vent bolt 4 to balance the air pressure between the inner cavity 2 and the oil channel 3-4. The upper end of the vent bolt 4 is located above the oil level, and the lower end is connected to the oil channel 3-4 of the honeycomb cooling block 3.

[0034] The oil drain port 3-7 of the diesel engine is located on the honeycomb cooling block 3, and the oil drain port 3-7 is connected to the oil passage 3-4.

[0035] The cross-sectional shape of the oil passage 3-4 is rectangular. The large area of ​​the hole allows for a large oil flow rate, and the rapid oil circulation can make full use of the flywheel's cooling air.

[0036] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An air-cooled diesel engine with internal and external oil circulation cooling, comprising an engine block (1), a gear chamber cover, a crankshaft, a flywheel, and an oil pump, wherein the axis of the crankshaft is axially aligned with the axis of the diesel engine, and the engine block (1) and the gear chamber cover form the inner cavity (2) of the diesel engine, characterized in that: The diesel engine has a honeycomb cooling block (3) fixed on the outer bottom surface of the engine body (1). The honeycomb cooling block (3) has a number of cooling through holes (3-1) that are in the same direction as the axis and allow the airflow blown by the flywheel to pass through. The cooling through holes (3-1) are arranged horizontally at intervals. The honeycomb cooling block (3) has an inlet (3-2) communicating with the diesel engine cavity (2) on the front side of the cooling through hole (3-1) and an outlet (3-3) communicating with the oil pump on the rear side of the cooling through hole (3-1). The inlet (3-2) is connected to the outlet (3-3) through an oil channel (3-4) that winds around the outer wall of each cooling through hole (3-1) in a wave-like manner. The oil channel (3-4) has a rectangular wave shape. The honeycomb cooling block (3) is an integral piece with an upper end face (3-6). The rectangular wave-shaped oil channel (3-4) has several upper flat sections (3-4-1). The outer bottom surface of the body (1) also serves as the upper wall surface of the upper flat section (3-4-1). The wall of the cooling through hole (3-1) is made of a thermally conductive material. The low-temperature air flowing through the cooling through hole (3-1) cools the high-temperature oil flowing through the oil channel (3-4) outside the wall of the cooling through hole (3-1).

2. The air-cooled diesel engine with internal and external oil circulation cooling according to claim 1, characterized in that: The body (1) is provided with a vent bolt (4) to balance the air pressure between the inner cavity (2) and the oil channel (3-4). The upper end of the vent bolt (4) is located above the oil level, and the lower end is connected to the oil channel (3-4) of the honeycomb cooling block (3).

3. The air-cooled diesel engine with internal and external oil circulation cooling according to claim 1, characterized in that: The outline of the honeycomb cooling block (3) is rectangular. The honeycomb cooling block (3) is fixed to the outer bottom surface of the body (1) by the upper flange edge (3-5) and fixing bolts (5).

4. The air-cooled diesel engine with internal and external oil circulation cooling according to claim 3, characterized in that: The cross-sectional shape of the cooling through hole (3-1) is rectangular.

5. The air-cooled diesel engine with internal and external oil circulation cooling according to claim 4, characterized in that: in A sealing gasket (6) is provided between the upper end face (3-6) and the outer bottom surface of the body (1). The sealing gasket (6) is mesh-shaped. The mesh-shaped sealing gasket (5) seals between the outer bottom surface of the body (1) and the upper end face (3-6) of the honeycomb cooling block (3) and between each upper flat section (3-4-1).

6. The air-cooled diesel engine with internal and external oil circulation cooling according to claim 1, characterized in that: The structure of the outlet (3-3) leading to the oil pump is as follows: it has an oil conduit (7), the upper end of which is screwed onto the bottom surface of the body (1) and connected to the axial oil hole (1-1) inside the bottom wall of the body (1), and the lower end is inserted into the outlet (3-3). The inlet of the oil pump outside the body (1) is connected to the axial oil hole (1-1).

7. The air-cooled diesel engine with internal and external oil circulation cooling according to claim 1, characterized in that: The oil drain port (3-7) of the diesel engine is located on the honeycomb cooling block (3), and the oil drain port (3-7) is connected to the oil passage (3-4).

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