V-type diesel engine block structure

Abstract

The application discloses a V-type diesel engine body structure, which comprises a body, at least two camshaft holes, a main oil passage for providing lubricating oil for the camshaft in the camshaft hole, two water distribution passages and two water collecting passages, the two water collecting passages are connected with water outlets at the front end of the body respectively, camshaft chambers are arranged on both sides of the camshaft hole on the body, the camshaft chambers are connected with lower cooling cavities of cylinder sleeves through splash oil and oil gas inlets, the lower cooling cavities of the cylinder sleeves are connected with crankcase cavities through splash oil return gaps, and the camshaft chambers are connected with the crankcase cavities. The structure of the application is divided into upper and lower parts for cooling, and the upper part is cooled by cooling liquid; since the lower part of the cylinder sleeve has small thermal load, the structure of the application uses non-forced cooling, splash oil and oil gas splashed by rotation of camshaft bearings are used to cool the lower part of the cylinder sleeve in a small amount, so that appropriate benefits are achieved, and excessive cooling to cause engine heat loss is avoided.

Description

Technical Field

[0001] This invention relates to an engine component, and more particularly to a V-type diesel engine block structure, belonging to the field of diesel engine technology. Background Technology

[0002] In the field of diesel engines, the engine block is the skeleton of the engine, and its structural form has a significant impact on various aspects of the diesel engine. Among them, the gantry-type engine block structure is mature, simple to manufacture, and widely used. For the V-type diesel engine block structure, it mainly includes the engine block, main bearing caps, main bearing cap bolts (or bolts and nuts), tie bolts, etc.

[0003] For V-type diesel engines with a two-cylinder structure, the design and development process prioritizes shared and integrated structural designs to reduce the number of parts, minimize sealing surfaces and leakage risks, and simultaneously increase the rigidity of the engine block, thereby reducing deformation and ensuring machining accuracy. Each cylinder bank in a V-type engine has its own cooling system. Currently, the industry has a new concept of "zoned cooling," which uses different cooling methods for different areas based on their characteristics to improve cooling efficiency and enhance the engine's high thermal efficiency.

[0004] Currently, for V-type heavy-duty engines, cylinder liners have the following two structures: 1) Top-mounted two-section type: upper support shoulder, upper positioning hole and lower positioning hole (O-ring seal); 2) Top-mounted three-section type: upper support shoulder, upper positioning hole, middle mounting hole (O-ring seal) and lower mounting hole (O-ring seal).

[0005] Currently, the top-mounted two-stage cooling structure is mainly used in traditional heavy-duty engine cylinder liner cooling water jacket structures, employing coolant cooling. For example... Figure 1 The diagram shows a conventional 6-cylinder inline engine cylinder liner cooling system. After the water channel, a single inlet allows water to enter from the bottom of the cylinder liner, cooling the liner itself before flowing into the top of the engine block to cool the cylinder head. Different heat load areas of the cylinder liner are cooled uniformly. The engine block typically has four or more water outlets (a), resulting in a complex structure. Furthermore, due to the need to cool the cylinder head, the diameter of each outlet varies, causing uneven water flow distribution in the cylinder liner water jacket. This leads to uneven cooling of the cylinder liner, affecting cylinder liner deformation, engine leakage, and oil consumption. Figure 1 In the diagram, b is cylinder liner mounting hole 1, c is engine block water channel, d is engine block water distribution hole (bottom water inlet of cylinder liner), and e is cylinder liner mounting hole 2 (sealing ring).

[0006] For the top three sections, the structure is divided into two types, the upper part of which is cooled by cooling liquid, and the lower part is cooled by cooling liquid or pressure lubricating oil. The above two structures are forced cooling for the cylinder sleeve part, which has complex structure, high sealing requirement, and small heat load for the lower part of the cylinder sleeve. Forced cooling will cause engine heat loss, but if not cooled, it may cause local overheating of the cylinder sleeve and engine cylinder. Figure 13 As shown in the existing V-type engine cylinder sleeve cooling schematic diagram, the upper and lower cooling water jackets are forced cooled by cooling liquid, and the distribution of the cooling liquid relies on the size control of the cooling liquid inlet and outlet, which may cause excessive cooling of the lower part of the cylinder sleeve. Figure 13 In the figure, f is a water collecting pipe, g is an upper water jacket, h is a water distributing pipe, i is a first sealing ring, j is a lower water jacket, and k is a second sealing ring. SUMMARY

[0007] The technical problem to be solved by the present application is how to simplify the structure of the engine and avoid excessive cooling of the lower part of the cylinder sleeve.

[0008] In order to solve the above technical problems, the technical scheme of the present application provides a V-type diesel engine body structure, characterized by comprising a body, two rows of cylinder sleeve mounting holes corresponding to two rows of cylinders are arranged on the top of the body, at least two camshaft holes, a main oil passage for providing lubricating oil for the camshaft in the camshaft hole, two water distribution channels and two water collecting channels are arranged on the body, the two water collecting channels are connected with the water outlets at the front end of the body, a cylinder sleeve is arranged in each cylinder sleeve mounting hole, a cylinder sleeve upper cooling cavity and a cylinder sleeve lower cooling cavity are arranged between the inner wall of the cylinder sleeve mounting hole and the outer wall of the cylinder sleeve, a water distribution hole and a water inlet hole are arranged at the position corresponding to each cylinder on the body, one end of all the water distribution holes and one end of all the water inlet holes are located on the top surface of the body, two water inlets are further arranged on the top surface of the body, the two water inlets are connected with the two water distribution channels in the body, the other end of each water distribution hole is connected with the water distribution channel, the other end of each water inlet hole is connected with the cylinder sleeve upper cooling cavity corresponding to the water inlet hole, and each cylinder sleeve upper cooling cavity is connected with the water collecting channel close to the cylinder sleeve upper cooling cavity through the backwater hole corresponding to the position of each cylinder.

[0009] Preferably, a cam bushing is arranged in the camshaft hole, a camshaft is arranged in the cam bushing, a hole connected with the main oil passage is arranged on the side of the cam bushing close to the main oil passage, and a hole connected with the camshaft chamber is arranged on the side of the cam bushing close to the camshaft chamber; the position of the camshaft chamber splash oil and oil gas inlet is opposite to the hole on the side of the cam bushing close to the camshaft chamber.

[0010] Preferably, the size of the splash oil return gap is smaller than the size of the camshaft chamber splash oil and oil gas inlet.

[0011] Preferably, the upper cylinder liner cooling cavity has only one water inlet hole and one water return hole, and the water inlet hole and the water return hole are located on opposite sides of the upper cylinder liner cooling cavity, respectively.

[0012] Preferably, the position of the water distribution hole and the water inlet hole corresponding to the position of each cylinder on the body corresponds to the position of the port at both ends of each cylinder head inner channel.

[0013] Preferably, the camshaft hole, the main oil way and the water distribution way are arranged between the two rows of cylinder liner mounting holes; and the two water collecting ways are arranged outside the two rows of cylinder liner mounting holes.

[0014] Preferably, the cylinder liner mounting hole is a three-section support structure, which is a first cylinder liner mounting hole, a second cylinder liner mounting hole and a third cylinder liner mounting hole, respectively; the inner wall of the second cylinder liner mounting hole and the outer wall of the cylinder liner are sealingly connected through a cylinder liner sealing ring; the inner wall of the cylinder liner mounting hole between the first cylinder liner mounting hole and the second cylinder liner mounting hole and the outer wall of the cylinder liner form an upper cylinder liner cooling cavity through a cylinder liner sealing ring; and the inner wall of the cylinder liner mounting hole between the second cylinder liner mounting hole and the third cylinder liner mounting hole and the outer wall of the cylinder liner form a lower cylinder liner cooling cavity through a cylinder liner sealing ring.

[0015] Preferably, the splash oil return gap is arranged on the body outside the third cylinder liner mounting hole.

[0016] Preferably, the included angle between the two rows of cylinder liner mounting holes forms a V-shaped structure; the cylinder liner mounting holes are all arranged opposite to the main shaft arranged in the body; the two water collecting ways are arranged on the body and located on the side of the cylinder liner mounting hole away from the center axis of the V-shaped angle; the camshaft hole and the main oil way are arranged on the center axis of the V-shaped angle; and the two water distribution ways are arranged on the body and located on the side of the cylinder liner mounting hole close to the center axis of the V-shaped angle.

[0017] Preferably, the main bearing cover is further arranged on the body, and the main bearing cover is provided with a main bearing hole for placing the main shaft.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The structure of the present application is divided into upper and lower parts for cooling, and the upper part is cooled by cooling liquid; since the lower part of the cylinder liner has a smaller heat load, the structure of the present application uses non-forced cooling, and the splash oil and oil gas splashed by the rotation of the camshaft bearing perform a small amount of cooling on the lower part of the cylinder liner, which has a proper benefit and avoids excessive cooling to cause engine heat loss.

[0020] For heavy duty diesel engine, camshaft generally adopts full support structure, that is, each main journal has lubricating oil, bearing and support; since each gear adopts pressure lubricating oil forced lubrication, the amount of splash oil leaked from each gear bearing is very sufficient, and the air flow in the crankcase can be used as coolant for the lower cooling cavity of cylinder liner.

[0021] Through the structure of the present application, the cooling liquid is respectively distributed to each cylinder head by the water distribution channel for cooling, and then returned to the upper cooling cavity of the cylinder liner for cooling the cylinder liner of each cylinder, and finally collected to the water collection channel and returned to the radiator (external connection); the high heat load area at the top of the cylinder liner is forced cooled by the cooling liquid, the inlet and outlet of the cooling liquid are respectively arranged on both sides of the center of the machine body, and the water flow direction is uniformly distributed; the low heat load area (i.e. the lower cooling cavity of the cylinder liner) of the cylinder liner is cooled (non-forced) by the part of the camshaft bearing lubricating oil splash and the crankcase oil gas. The main bearing cover bolt on the machine body is assembled and fastened by the stretcher, the cross pull bolt connects the machine body and the main bearing cover, and the rigidity of the gantry type machine body is increased. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the existing 6-cylinder in-line engine cylinder liner cooling;

[0023] Figure 2 It is a front view of a V-type diesel engine machine body structure;

[0024] Figure 3 It is Figure 2 the left view (part of Figure 7 A1-A1 sectional view in

[0025] Figure 4 It is Figure 2 the rear view;

[0026] Figure 5 It is Figure 2 the bottom view;

[0027] Figure 6 It is Figure 2 the right view ( Figure 7 A-A half sectional view in

[0028] Figure 7 It is Figure 4 the top view;

[0029] Figure 8 It is Figure 7 A2-A2 partial sectional view (water distribution channel and water distribution hole sectional view) in

[0030] Figure 9 It is an axial side view of a V-type diesel engine machine body structure;

[0031] Figure 10 A schematic diagram of the cooling water flow at the top of the cylinder liner (cylinder liner assembly) Figure 11 (B1-B1 sectional view in the diagram);

[0032] Figure 11 A schematic diagram of the cooling water flow at the top of the cylinder liner (cylinder liner assembly) Figure 10 (BB section view in the middle);

[0033] Figure 12 Schematic diagram of the cooling system for the lower part of the cylinder liner in the engine block (cylinder liner assembly) Figure 10 (B2-B2 section view);

[0034] Figure 13 This is a schematic diagram of the existing V-type engine cylinder liner cooling system. Detailed Implementation

[0035] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0036] In this invention, "left and right" and "up and down" refer to the positions of the various components in the accompanying drawings.

[0037] This invention provides a V-type diesel engine block structure, such as Figures 2-12 As shown, it includes a body 1, a main bearing cover 4, tie bolts 2 and washers 3, main bearing cover bolts 5 and nuts 6. After assembly, the main bearing holes 1.10 are machined together to form the body structure of the present invention. The bottom of the main bearing cover 4 is provided with main bearing cover bolts 5, and the main bearing cover bolts 5 and nuts 6 are connected by threads. The main bearing cover 4 is located in the middle of the lower part of the body 1. Both sides of the main bearing cover 4 are connected to the body 1 by tie bolts 2. One end of each tie bolt 2 passes through the washer 3 and one side of the body 1 to connect with the main bearing cover 4.

[0038] like Figure 3 , Figure 5 , Figure 6 , Figure 7 As shown, the top left and right sides of the machine body 1 are provided with two rows of cylinder liner mounting holes corresponding to the two rows of cylinders respectively. The included angle between the two rows of cylinder liner mounting holes forms a V-shaped structure, which is the V-angle. The cylinder liner mounting holes are all directly opposite the main shaft installed in the machine body 1. The cooling and lubrication systems of the two rows of cylinders are independent. The main bearing cover 4 is provided with a main bearing hole 1.10 for placing the main shaft.

[0039] The region of the body 1 located in the V-shaped angle is provided with at least two (7 in this embodiment) camshaft holes 1.8, one main oil passage 1.9 and two branch water passages 1.1, and the body 1 is further provided with two water collecting passages 1.4, which are respectively arranged on the body 1 and located on the side of the cylinder sleeve mounting hole away from the central axis of the V-shaped angle. The camshaft hole 1.8 and the main oil passage 1.9 are both arranged on the central axis of the V-shaped angle; the two branch water passages 1.1 are respectively arranged on the body 1 and located on the side of the cylinder sleeve mounting hole close to the central axis of the V-shaped angle.

[0040] As shown in Figure 11 , a cylinder sleeve 7 is arranged in each cylinder sleeve mounting hole. As shown in Figure 6 , the cylinder sleeve mounting hole is a three-section support structure, which is respectively a first cylinder sleeve mounting hole 1.15, a second cylinder sleeve mounting hole 1.13 and a third cylinder sleeve mounting hole 1.11, and the inner wall of the second cylinder sleeve mounting hole 1.13 is sealingly connected with the outer wall of the cylinder sleeve 7 through a cylinder sleeve sealing ring 8, as shown in Figure 11 ; the cylinder sleeve sealing ring 8 is a rubber ring sealing.

[0041] As shown in Figure 6 , Figure 12 , the inner wall of the cylinder sleeve mounting hole located between the first cylinder sleeve mounting hole 1.15 and the second cylinder sleeve mounting hole 1.13 and the outer wall of the cylinder sleeve 7 are sealingly connected through the cylinder sleeve sealing ring 8 to form an upper cylinder sleeve cooling cavity 1.14; the inner wall of the cylinder sleeve mounting hole located between the second cylinder sleeve mounting hole 1.13 and the third cylinder sleeve mounting hole 1.11 and the outer wall of the cylinder sleeve 7 are sealingly connected through the cylinder sleeve sealing ring 8 to form a lower cylinder sleeve cooling cavity 1.12.

[0042] Each cylinder head covers one cylinder sleeve mounting hole corresponding thereto, and each cylinder head is provided with a channel, the two ends of the channel are respectively connected with one end of the branch water hole 1.5 and one end of the water inlet hole 1.2 and are in communication, and one end of the branch water hole 1.5 and one end of the water inlet hole 1.2 are both located on the top surface of the body 1.

[0043] As shown in Figure 8 , Figure 10 , Figure 11 , the top surface of the body 1 is provided with two water inlets 1.16, the water inlets 1.16 are respectively connected with the branch water passages 1.1 located on the left and right sides in the body 1, the other end of each branch water hole 1.5 corresponding to the position of each cylinder is connected with the branch water passage 1.1, the other end of each water inlet hole 1.2 is connected with one upper cylinder sleeve cooling cavity 1.14 corresponding thereto, and each upper cylinder sleeve cooling cavity 1.14 is connected with the water collecting passages 1.4 on the left and right sides of the body 1 through a backwater hole 1.3 corresponding to the position of each cylinder, and the two water collecting passages 1.4 are respectively connected with a water outlet 1.17 at the front end of the body 1, and the water outlet 1.17 is connected to a radiator (the radiator is a structure outside the V-shaped diesel engine body structure, and therefore is not shown in the figure) through a pipeline.

[0044] As Figure 11 , Figure 12 shown, the cylinder liner cooling jacket (i.e. the upper cylinder liner cooling cavity 1.14) is connected with the crankcase cavity 1.19 through the splash oil return gap 1.18 in the cylinder block 1 at the position outside the third cylinder liner mounting hole 1.11, and is connected with the camshaft chamber 1.6 through the camshaft chamber splash oil and oil gas inlet 1.7. The position of the camshaft chamber splash oil and oil gas inlet 1.7 is opposite to the hole on the upper side of the cam bushing close to the camshaft chamber 1.6, so that the splash oil of the rotating camshaft can enter the cylinder liner cooling jacket through the camshaft chamber splash oil and oil gas inlet 1.7.

[0045] As Figure 6 , Figure 12 shown, the camshaft chamber 1.6 is connected with the lower cylinder liner cooling cavity 1.12 through the camshaft chamber splash oil and oil gas inlet 1.7, and the lower cylinder liner cooling cavity 1.12 is connected with the crankcase cavity 1.19 through the splash oil return gap 1.18 provided on the cylinder block 1 at the position outside the third cylinder liner mounting hole 1.11. The position of the camshaft chamber splash oil and oil gas inlet 1.7 is opposite to the hole on the upper side of the cam bushing close to the camshaft chamber 1.6, so that the splash oil of the rotating camshaft can enter the cylinder liner cooling jacket through the camshaft chamber splash oil and oil gas inlet 1.7.

[0046] The size of the splash oil return gap 1.18 is smaller than that of the camshaft chamber splash oil and oil gas inlet 1.7. When the rotating speed of the camshaft is higher and higher, the speed of the splash oil and oil gas entering the lower cylinder liner cooling cavity 1.12 is also higher and higher. When the speed of the splash oil and oil gas entering the lower cylinder liner cooling cavity 1.12 from the camshaft chamber 1.6 is higher than the speed of the splash oil and oil gas out of the splash oil return gap 1.18 in the lower cylinder liner cooling cavity 1.12, the amount of the splash oil and oil gas in the lower cylinder liner cooling cavity 1.12 gradually increases, thereby increasing the cooling speed in the lower cylinder liner cooling cavity 1.12.

[0047] The working principle of the present application is as follows:

[0048] As Figure 8 , Figure 10 , Figure 11 shown, the upper cylinder liner cooling mode: the cooling liquid enters the left and right water distribution channels 1.1 through the water inlets 1.16, enters the cylinder head (not shown in the figure) through the water distribution holes 1.5 corresponding to the positions of each cylinder, then enters the upper cylinder liner cooling cavity 1.14 through the water inlets 1.2, and then enters the left and right water collection channels 1.4 through the water outlets 1.3 corresponding to the positions of each cylinder, and finally enters the radiator through the water outlets 1.17 at the front end of the cylinder block 1. The cooling liquid in the upper cylinder liner cooling cavity 1.14 cools the cylinder block 1 and the cylinder liner 7 outside the upper cylinder liner cooling cavity 1.14.

[0049] As Figure 6 , Figure 12As shown, the camshaft hole 1.8 is provided with a cam bushing, the cam bushing is provided with a camshaft, a hole is provided on the side of the cam bushing close to the main oil passage 1.9 and communicated with the main oil passage 1.9, and a hole is provided on the side of the cam bushing close to the camshaft chamber 1.6 and communicated with the camshaft chamber 1.6, so that the oil in the main oil passage 1.9 enters between the cam bushing and the camshaft to lubricate the camshaft.

[0050] When the camshaft rotates, the lubricating oil of the camshaft bearing is discharged together with the oil gas, enters the camshaft chamber 1.6 through the centrifugal force of the camshaft rotation, and part of the lubricating oil and the oil gas enter the lower cooling cavity 1.12 of the cylinder sleeve through the splash oil and the oil gas inlet 1.7, and then return to the crankcase cavity 1.19 through the splash oil return gap 1.18 on the third cylinder sleeve mounting hole 1.11. Another part of the lubricating oil directly enters the crankcase cavity 1.19 from the camshaft chamber 1.6. The lubricating oil in the crankcase cavity 1.19 is collected in the oil pan and then circulated to other parts for cooling and filtering, and then reenters the main oil passage 1.9 for use. The oil and oil gas entering the lower cooling cavity 1.12 of the cylinder sleeve cool the cylinder sleeve 7 and the engine block 1 outside the lower cooling cavity 1.12.

[0051] The temperature difference around the cylinder sleeve 7 is small, which reduces the deformation amount of the cylinder sleeve mounting hole caused by uneven thermal load during engine operation.

[0052] In the embodiment, the material of the engine block 1 is selected to be QT450-10, which has high strength and high fatigue resistance and can meet the high burst pressure requirement of the engine. The main bearing cover 4 is made of QT500-7, and the main bearing cover bolt 5, the nut 6 and the cross bolt 2 are made of 42CrMo, which meets the high-grade and high-preload requirements of the engine fasteners.

[0053] The present application utilizes the fact that the camshaft of the V-type engine is located in the V-angle, the position of the camshaft is just right, and the lower cooling cavity of the cylinder sleeve and the camshaft chamber can be connected, so that splash and oil gas cooling can be realized. There is no need to specially design the structure for splash lubrication.

Claims

1. A V-type diesel engine block structure, characterized in that, The machine includes a body (1). The top of the body (1) has two rows of cylinder liner mounting holes on both sides, corresponding to two rows of cylinders. The body (1) has at least two camshaft holes (1.8), a main oil passage (1.9) that provides lubricating oil to the camshaft in the camshaft hole (1.8), two water distribution channels (1.1) and two water collection channels (1.4). The two water collection channels (1.4) are connected to the water outlet (1.17) at the front end of the body (1). Each cylinder liner mounting hole has a cylinder liner. (7) A cooling chamber (1.14) for the upper part of the cylinder liner and a cooling chamber (1.12) for the lower part of the cylinder liner are provided between the inner wall of the cylinder liner mounting hole and the outer wall of the cylinder liner (7). A water distribution hole (1.5) and a water inlet hole (1.2) are provided at the location of each cylinder on the engine block (1). One end of all water distribution holes (1.5) and one end of all water inlets (1.2) are located on the top surface of the engine block (1). The top surface of the engine block (1) is also provided with two water inlets (1.16). (1.16) is connected to two water channels (1.1) inside the engine block (1), and the other end of each water inlet (1.5) is connected to the water channel (1.1). The other end of each water inlet (1.2) is connected to the upper cooling chamber (1.14) of a corresponding cylinder liner. Each upper cooling chamber (1.14) of the cylinder liner is connected to the water collection channel (1.4) near the upper cooling chamber (1.14) of the cylinder liner through the return water hole (1.3) corresponding to the location of each cylinder. (1) Camshaft chambers (16) are provided on both sides of the upper camshaft hole (1.8) for collecting lubricating oil splashed out during camshaft rotation. The camshaft chamber (16) is connected to the lower cooling chamber (1.12) of the cylinder liner through the camshaft chamber splash oil and oil-gas inlet (1.7). The lower cooling chamber (1.12) of the cylinder liner is connected to the crankcase cavity (1.19) through the splash oil return notch (1.18). The camshaft chamber (1.6) is connected to the crankcase cavity (1.19).

2. The V-type diesel engine block structure as described in claim 1, characterized in that, The cam bushing is provided in the camshaft hole (1.8), and the camshaft is provided in the cam bushing. The cam bushing has a hole on the side near the main oil passage (1.9) that communicates with the main oil passage (1.9), and the cam bushing has a hole on the side near the camshaft chamber (1.6) that communicates with the camshaft chamber (1.6). The position of the splash oil and oil-gas inlet (1.7) of the camshaft chamber is directly opposite the hole on the side of the cam bushing near the camshaft chamber (1.6).

3. The V-type diesel engine block structure as described in claim 1, characterized in that, The size of the splash oil return notch (1.18) is smaller than the size of the splash oil and oil-gas inlet (1.7) of the camshaft chamber.

4. The V-type diesel engine block structure as described in claim 1, characterized in that, The upper cooling chamber (1.14) of the cylinder liner has only one water inlet (1.2) and one water return (1.3), and the water inlet (1.2) and the water return (1.3) are located on opposite sides of the upper cooling chamber (1.14) of the cylinder liner.

5. The V-type diesel engine block structure as described in claim 1, characterized in that, The positions of the water distribution hole (1.5) and water inlet hole (1.2) corresponding to the location of each cylinder on the machine body (1) correspond to the positions of the ports at both ends of the channel inside each cylinder head.

6. The V-type diesel engine block structure as described in claim 1, characterized in that, The camshaft hole (1.8), main oil passage (1.9) and water distribution passage (1.1) are all located between the two rows of cylinder liner mounting holes; the two water collection passages (1.4) are located on the outside of the two rows of cylinder liner mounting holes respectively.

7. The V-type diesel engine block structure as described in claim 1, characterized in that, The cylinder liner mounting hole is a three-section support structure, namely a first cylinder liner mounting hole (1.15), a second cylinder liner mounting hole (1.13), and a third cylinder liner mounting hole (1.11). The inner wall of the second cylinder liner mounting hole (1.13) is sealed to the outer wall of the cylinder liner (7) by a cylinder liner sealing ring (8). The inner wall of the cylinder liner mounting hole located between the first cylinder liner mounting hole (1.15) and the second cylinder liner mounting hole (1.13) is connected to the outer wall of the cylinder liner (7) by a cylinder liner sealing ring (8) to form an upper cooling chamber (1.14) of the cylinder liner. The inner wall of the cylinder liner mounting hole located between the second cylinder liner mounting hole (1.13) and the third cylinder liner mounting hole (1.11) is connected to the outer wall of the cylinder liner (7) by a cylinder liner sealing ring (8) to form a lower cooling chamber (1.12) of the cylinder liner.

8. The V-type diesel engine block structure as described in claim 7, characterized in that, The splash oil return notch (1.18) is located on the engine body (1) at a position outside the third cylinder liner mounting hole (1.11).

9. The V-type diesel engine block structure as described in claim 1, characterized in that, The included angle between the two rows of cylinder liner mounting holes forms a V-shaped structure; the cylinder liner mounting holes are all directly opposite the main shaft installed in the engine block (1); the two water collection channels (1.4) are respectively located on the engine block (1) and on the side of the cylinder liner mounting holes away from the center axis of the V-angle; the camshaft hole (1.8) and the main oil passage (1.9) are both located on the center axis of the V-angle; the two water distribution channels (1.1) are respectively located on the engine block (1) and on the side of the cylinder liner mounting holes close to the center axis of the V-angle.

10. The V-type diesel engine block structure as described in claim 1, characterized in that, It also includes a main bearing cover (4), which has a main bearing hole (1.10) for placing the main shaft.

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