Water channel structure for improving cooling between two cylinders of cylinder block

Abstract

The invention provides a water channel structure for improving cooling between two cylinders of a cylinder block, which is characterized in that a first water channel and a second water channel are transversely arranged in a cylinder block body between adjacent cylinder holes, and a first round hole is formed downwards from the upper surface of the cylinder block body and is separated from the cylinder hole water channels; the second round hole is formed downwards from the upper surface of the cylinder block body and communicated with the cylinder hole water channel, the first round hole is formed in one side of a cylinder hole center connecting line, the second round hole is formed in the other side of the cylinder hole center connecting line, one end of the first water channel is communicated with the first round hole, and the other end of the first water channel is communicated with the second round hole. One end of the second water channel is communicated with the first round hole, and the other end is communicated with the second round hole; the second water channel is positioned below the first water channel. A double-V-shaped cooling water channel structure is adopted, cooling between two cylinders is well improved, the heat transfer coefficient of the 1 / 3 stroke height of the upper portion of the cylinder sleeve is increased, thermal deformation of a cylinder hole is reduced, the cylinder hole keeps good roundness, friction work of an engine is reduced, and reliability and economical efficiency of the engine are improved.

Description

Technical Field

[0001] This invention belongs to the field of diesel engine technology, specifically a water channel structure for improving cooling between two cylinders in a cylinder block. Background Technology

[0002] Currently, in existing diesel engine technology, cooling water channels are often installed between adjacent cylinders in the engine block. These channels are typically single V-shaped. For example, Chinese patent CN113153560A discloses a cooling structure between two cylinder bores, which includes a cylinder block body, cylinder bores, cylinder bore water channels, and oblique water holes. The cylinder block body has several cylinder bores, and cylinder bore water channels are arranged around the cylinder bores to cool them. The cylinder bore water channels have intersecting oblique water holes, one side of which communicates with the cylinder bore water channel on the same side, and the other side of which... The cylinder bore water passages on the same side are disconnected, which increases the pressure between the cylinder bores, thereby increasing the water flow rate and heat transfer coefficient. Another example is the cross water passage structure for adjacent cylinders of an internal combustion engine disclosed in Chinese patent CN206530414U. The cross water passage structure adds a process cone hole at the top of the cross water passage between the two cylinders, which increases the feed rate of the cross water passage machining, thereby increasing machining efficiency, reducing machining costs, and improving machining accuracy. It also ensures the machining quality and cooling capacity of the cross water passage, which helps to improve the working reliability of the internal combustion engine.

[0003] The above structure still has drawbacks: when using a shallow, single-channel V-shaped water passage, the cylinder liner and piston top are cooled, but the lower part of the V-shaped water passage, i.e., the middle and lower part between the two cylinders where there is no water passage, turns yellow at high temperature, and the cylinder bore mesh shows obvious wear. When using a shallow V-shaped water passage, the piston and cylinder liner top cannot be repeatedly cooled, the engine oil cokes, and the piston rings are prone to jamming. Summary of the Invention

[0004] This invention provides a water channel structure for improving cooling between two cylinders in a cylinder block. The double V-shaped cooling water channel structure significantly improves cooling between the two cylinders, increases the heat transfer coefficient of the upper 1 / 3 stroke height of the cylinder liner, reduces cylinder bore thermal deformation, maintains better cylinder bore roundness, reduces engine friction work, and improves engine reliability and economy.

[0005] To achieve the above objectives, the present invention provides a water channel structure for improving cooling between two cylinders in a cylinder block, comprising: a cylinder block body, cylinder bores, cylinder bore water channels, a first water channel, a second water channel, a first circular hole, and a second circular hole; the cylinder block body is provided with two or more cylinder bores, and the cylinder bore water channels are provided around the cylinder bores for cooling the cylinder bores; the first water channel and the second water channel are both laterally arranged inside the cylinder block body between adjacent cylinder bores; the first circular hole extends downward from the upper surface of the cylinder block body and is separated from the cylinder bore water channels; the second circular hole extends downward from the upper surface of the cylinder block body and communicates with the cylinder bore water channels; the first circular hole is located on one side of the line connecting the centers of the cylinder bores, and the second circular hole is located on the other side of the line connecting the centers of the cylinder bores; one end of the first water channel communicates with the first circular hole and the other end communicates with the second circular hole; one end of the second water channel communicates with the first circular hole and the other end communicates with the second circular hole; the second water channel is located below the first water channel.

[0006] This invention employs two cooling channels of different depths to cool the engine block. The shallower channel, the first channel, is located near the piston head and piston rings, providing excellent cooling for the piston ring sealing area. The deeper channel, the second channel, is located below the first channel, providing excellent cooling for the upper part of the cylinder liner, where the cylinder bore generates significant heat. This repeated cooling of the piston and cylinder liner tops prevents oil buildup and piston ring seizure.

[0007] Preferably, both the first and second waterways are constructed as V-shaped waterway structures. This design is simple, can be machined, has low cost, and is easy to implement.

[0008] Preferably, the bottom depth of the first water channel is 0.30 to 0.35 times the piston stroke, and the bottom depth of the second water channel is 0.13 to 0.17 times the piston stroke. The area at the top 1 / 3 of the piston stroke is a region where heat is concentrated. Two processing water channels are used for cooling at the top 1 / 3 of the piston stroke. The first water channel is a shallow V-shaped cross water channel located near the piston rings at the piston head, providing good cooling for the piston ring sealing area. The second water channel is a deep V-shaped cross water channel located near the top 1 / 3 of the cylinder bore, providing good cooling for the upper 1 / 3 of the cylinder liner stroke height where the cylinder bore has a large heat dissipation. It includes a cross V-shaped water channel near the top of the cylinder bore and a V-shaped water channel near the middle of the cylinder bore.

[0009] Preferably, both the first and second round holes are machined vertically downwards; one of the two vertical round holes is drilled through to the water jacket of the machine body, while the other is not drilled through. Cooling water enters the V-shaped water channel from the drilled vertical round hole and then flows out from the undrilled vertical round hole.

[0010] Preferably, both the first and second circular holes are located above the edge of the cylinder bore water channel. The first and second circular holes are symmetrical about the longitudinal centerline of the cylinder bore, which is the line connecting the centers of multiple cylinder bores. This facilitates manufacturing, shortens the length of the first and second water channels, and improves heat dissipation efficiency.

[0011] Preferably, the V-shaped intersection of the first and second water channels is located on the longitudinal centerline of the cylinder bore. The symmetrical V-shaped structure facilitates machining and positioning, and also promotes uniform heat dissipation from the piston head and heat-concentrating areas.

[0012] Preferably, the cooling water of the present invention flows through the cylinder bore water passage, the second round hole, the first water passage, the second water passage, and the first round hole before entering the cylinder head water passage. Specifically, it can be divided into two paths: the first path is through the cylinder bore water passage, the second round hole, the first water passage, the first round hole, and then the cylinder head water passage, which cools the piston ring area; the second path is through the cylinder bore water passage, the second round hole, the second water passage, the first round hole, and then the cylinder head water passage, which cools the middle height area of ​​the cylinder. This allows for faster heat transfer from the cylinder block to other areas, such as the cylinder head water passage, resulting in better heat dissipation and higher cooling efficiency.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The system employs a double V-shaped cross-channel design, consisting of a deep and a shallow V-shaped cross-channel. The shallow V-shaped cross-channel is located near the piston rings at the piston head, providing good cooling for the piston ring sealing area. The deep V-shaped cross-channel is located near the top 1 / 3 of the cylinder bore, providing good cooling for the upper 1 / 3 of the cylinder liner stroke, which has a larger heat dissipation capacity. This increases the upper 1 / 3 of the cylinder liner stroke height (HTC) (heat transfer coefficient 15%~35%, good heat dissipation effect), allowing for repeated cooling of the piston and cylinder liner tops, preventing oil coking and piston ring seizure.

[0015] One of the two vertical round holes is drilled through the engine block's water jacket, while the other is not. Cooling water enters the V-shaped water channel through the drilled vertical round hole and then flows out through the un-drilled vertical round hole, which can quickly transfer heat from the cylinder block to other places, resulting in better heat dissipation.

[0016] The double V-shaped cooling channels and vertical circular holes are formed by machining, which is low-cost and easy to implement. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of a water channel structure for improving cooling between two cylinders in a cylinder block, as described in this invention.

[0018] Figure 2 This is a schematic diagram of the structure of the cylinder block body described in this invention.

[0019] Figure 3 and Figure 4 This is a schematic diagram of the single-V cooling water channel structure in the existing technology.

[0020] In the diagram: 1-Cylinder block body, 2-Cylinder bore, 3-Cylinder bore water passage, 4-First water passage, 5-Second water passage, 6-First round hole, 7-Second round hole. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0022] In the description of this invention, it should be understood that the terms "left", "right", "up", "down", "front", "back", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] Example 1:

[0024] To achieve the above objectives, this embodiment provides a water channel structure for improving cooling between the two cylinders in a cylinder block.

[0025] like Figure 1 and Figure 2 As shown, where, Figure 1 for Figure 2 A cross-sectional view along the AA direction includes: a cylinder block body 1, cylinder bores 2, cylinder bore water channels 3, a first water channel 4, a second water channel 5, a first circular hole 6, and a second circular hole 7; the cylinder block body 1 is provided with four cylinder bores 2, and the cylinder bore water channels 3 are arranged around the cylinder bores 2 for cooling the cylinder bores 2; the first water channel 4 and the second water channel 5 are both arranged laterally inside the cylinder block body 1 between adjacent cylinder bores 2; the first circular hole 6 is arranged downward from the upper surface of the cylinder block body 1 and is separated from the cylinder bore water channels 3; the second circular hole 7 is arranged downward from the upper surface of the cylinder block body 1 and communicates with the cylinder bore water channels 3; the first circular hole 6 is located on one side of the center line connecting the cylinder bores 2 and the second circular hole 7 is located on the other side of the center line connecting the cylinder bores 2; one end of the first water channel 4 communicates with the first circular hole 6 and the other end communicates with the second circular hole 7; one end of the second water channel 5 communicates with the first circular hole 6 and the other end communicates with the second circular hole 7; the second water channel 5 is located below the first water channel 4.

[0026] The working principle of this embodiment is as follows: the coolant enters the cylinder head water passage after passing through cylinder bore water passage 3, second round hole 7, first water passage 4, second water passage 5, and first round hole 6. This embodiment uses two water passages of different depths to cool the engine block. The shallow water passage, namely the first water passage 4, is located near the piston rings at the piston head, providing good cooling for the piston ring sealing area. The deep water passage, namely the second water passage 5, is located below the first water passage 4, providing good cooling for the corresponding height of the upper part of the cylinder liner where the cylinder bore 2 has a larger heat dissipation. The piston and the top of the cylinder liner receive repeated cooling, avoiding the phenomenon of oil coking and piston ring seizure.

[0027] Example 2:

[0028] like Figure 1 and Figure 2 As shown, in this example, the longitudinal direction is the long side direction of the cylinder block body 1, and the transverse direction is the short side direction of the cylinder block body 1.

[0029] This embodiment addresses engine blocks employing a single V-channel structure in the prior art, such as... Figure 3 and Figure 4 As shown, there are problems such as poor cooling effect and oil coking, which can easily cause piston rings to seize. To address these issues, a water channel structure is provided to improve cooling between the two cylinders of a cylinder block. The structure includes: a cylinder block body 1, cylinder bores 2, cylinder bore water channels 3, a first water channel 4, a second water channel 5, a first circular hole 6, and a second circular hole 7. The cylinder block body 1 has four cylinder bores 2, and the cylinder bore water channels 3 are arranged around each cylinder bore 2 for cooling the cylinder bores 2. The first water channel 4 and the second water channel 5 are both laterally arranged inside the cylinder block body 1 between adjacent cylinder bores 2. The first circular hole 6 is disposed downward from the upper surface of the cylinder body 1 and is separated from the cylinder bore water channel 3. The second circular hole 7 is disposed downward from the upper surface of the cylinder body 1 and is connected to the cylinder bore water channel 3. The first circular hole 6 is disposed on one side of the center line connecting the cylinder bores 2 and the second circular hole 7 is disposed on the other side of the center line connecting the cylinder bores 2. One end of the first water channel 4 is connected to the first circular hole 6 and the other end is connected to the second circular hole 7. One end of the second water channel 5 is connected to the first circular hole 6 and the other end is connected to the second circular hole 7. The second water channel 5 is located below the first water channel 4.

[0030] In this embodiment, both the first waterway 4 and the second waterway 5 are constructed as V-shaped waterway structures. The structures are simple, can be machined, are low-cost, and easy to implement.

[0031] In this embodiment, the bottom depth s of the first waterway 4 is 0.30 times the piston stroke, and the bottom depth d of the second waterway 5 is 0.13 times the piston stroke. Specifically, in this embodiment, the piston stroke is 107 mm, s is 13.9 mm, and d is 32.1 mm.

[0032] In this embodiment, the first circular hole 6 and the second circular hole 7 are both machined vertically downwards; one of the two vertical circular holes is drilled through to the water jacket of the machine body, while the other is not drilled through. Cooling water enters the V-shaped water channel from the drilled vertical circular hole and then flows out from the undrilled vertical circular hole.

[0033] In this embodiment, the first circular hole 6 and the second circular hole 7 are both located above the edge of the cylinder bore water channel 3, and the first circular hole 6 and the second circular hole 7 are symmetrical about the longitudinal centerline of the cylinder bore 2. This facilitates processing, shortens the length of the first water channel 4 and the second water channel 5, and improves heat dissipation efficiency.

[0034] In this embodiment, the V-shaped intersection of the first waterway 4 and the second waterway 5 is located on the longitudinal center line of the cylinder bore 2.

[0035] In this embodiment, cooling water flows through cylinder bore water passage 3, second round hole 7, first water passage 4, second water passage 5, and first round hole 6 before entering the cylinder head water passage. Specifically, it can be divided into two paths: the first path, consisting of cylinder bore water passage 3, second round hole 7, first water passage 4, first round hole 6, and cylinder head water passage, cools the piston ring area; the second path, consisting of cylinder bore water passage 3, second round hole 7, second water passage 5, first round hole 6, and cylinder head water passage, cools the middle section of the cylinder.

[0036] Compared with the prior art, the present embodiment has better performance. After CAE simulation calculation, the following results were obtained: In the prior art, the heat transfer coefficient (HTCW / ㎡.K) of the upper 1 / 3 stroke height of the cylinder liner using a single V-shaped water channel structure is 5470. In this embodiment, after the flow field is optimized by the double V-shaped water channel, the heat transfer coefficient is 7379, which greatly improves the heat transfer efficiency.

[0037] This embodiment also included a disassembly and inspection after durability testing. All four cylinders in this embodiment were in good condition. Cylinder 1 showed localized shine on the intake and exhaust sides, slight yellowing from high temperatures and minor scratches between the two rear cylinders, but its overall condition was good. Cylinder 2 showed slight yellowing from high temperatures between both cylinders, and vertical scratches in all four directions of the cylinder bore, most noticeable at the rear, but none were palpable. Cylinder 3 showed slight yellowing from high temperatures between both cylinders, and more obvious vertical scratches in all four directions of the cylinder bore, but none were palpable; the fire land's texture was worn. Cylinder 4 showed slight yellowing from high temperatures between both cylinders, and more obvious vertical scratches in all four directions of the cylinder bore, but none were palpable; the fire land's texture was also worn. Significant carbon deposits were present in the combustion chamber of each cylinder. These phenomena indicate that the present invention has better heat dissipation and cooling effects, less cylinder wear, and no significant carbon deposits or scratches.

[0038] Furthermore, the piston disassembly and inspection results of this embodiment show that there is no obvious carbon buildup on the piston top surface; there is a small amount of carbon buildup on the piston ring lands; the exhaust side skirt is partially shiny; the piston bottom shows almost no high-temperature oxidation; and the rear piston pin seat hole shows high-temperature yellowing. It is evident that this invention provides good cooling at the piston ring position, resulting in less wear and damage to the piston after use, and demonstrating good performance.

[0039] Example 3:

[0040] The difference between this embodiment and the above embodiment 2 is that the bottom depth d of the first waterway 4 is 0.35 times the piston stroke, and the bottom depth s of the second waterway 5 is 0.17 times the piston stroke. Specifically, in this embodiment, the piston stroke is 107 mm, s is 18.2 mm, and d is 37.5 mm.

Claims

1. A water channel structure for improving cooling between two cylinders in a cylinder block, characterized in that... include: The cylinder body (1) comprises a cylinder bore (2), a cylinder bore water channel (3), a first water channel (4), a second water channel (5), a first round hole (6), and a second round hole (7). The cylinder body (1) is provided with two or more cylinder bores (2), and the cylinder bore water channel (3) is provided around the cylinder bores (2). The cylinder bore water channel (3) is used to cool the cylinder bores (2). The first water channel (4) and the second water channel (5) are both arranged laterally inside the cylinder body (1) between adjacent cylinder bores (2). The first round hole (6) is set downward from the upper surface of the cylinder body (1). It is separated from the cylinder bore water channel (3). The second round hole (7) is set downward from the upper surface of the cylinder body (1) and communicates with the cylinder bore water channel (3). The first round hole (6) is set on one side of the center line of the cylinder bore (2) and the second round hole (7) is set on the other side of the center line of the cylinder bore (2). One end of the first water channel (4) is connected to the first round hole (6) and the other end is connected to the second round hole (7). One end of the second water channel (5) is connected to the first round hole (6) and the other end is connected to the second round hole (7). The second water channel (5) is located below the first water channel (4).

2. The water channel structure for improving cooling between two cylinders in a cylinder block according to claim 1, characterized in that: Both the first waterway (4) and the second waterway (5) are constructed as V-shaped waterway structures.

3. The water channel structure for improving cooling between two cylinders in a cylinder block according to claim 1, characterized in that: The bottom depth of the first water channel (4) is 0.30 to 0.35 times the piston stroke, and the bottom depth of the second water channel (5) is 0.13 to 0.17 times the piston stroke.

4. The water channel structure for improving cooling between two cylinders in a cylinder block according to claim 1, characterized in that: The first round hole (6) and the second round hole (7) are both machined vertically downwards.

5. The water channel structure for improving cooling between two cylinders in a cylinder block according to claim 1, characterized in that: The first round hole (6) and the second round hole (7) are both located above the edge of the cylinder hole waterway (3), and the first round hole (6) and the second round hole (7) are symmetrical about the longitudinal center line of the cylinder hole (2).

6. The water channel structure for improving cooling between two cylinders in a cylinder block according to claim 2, characterized in that: The V-shaped intersection of the first waterway (4) and the second waterway (5) is located on the longitudinal center line of the cylinder bore (2).

7. The water channel structure for improving cooling between two cylinders in a cylinder block according to claim 2, characterized in that: The cooling water of the present invention flows through the cylinder bore water passage (3), the second round hole (7), the first water passage (4), the second water passage (5), and the first round hole (6) before entering the cylinder head water passage.

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