Front end arrangement of V12 common rail diesel engine

Abstract

The invention discloses a front end arrangement of a V12 common rail diesel engine, and belongs to the field of diesel engine manufacturing. A front transmission case is arranged on the periphery of a crankshaft, and parts required by a cooling system and a lubricating system of the diesel engine are intensively arranged on the front transmission case; the front transmission case is provided with a reserved front end power output port for the flywheel end to output main power. A built-in water cavity, a main oil duct and an embedded oil collecting chamber are arranged in the front transmission case; a through hole for the crankshaft to penetrate out is formed in the lower portion of the front transmission box, and a middle transmission gear is arranged at the upper end of the through hole. The problems that all parts of a cooling system and a lubricating system cannot be arranged in a centralized mode, the space arrangement of the parts at the front end is huge, and a large amount of liquid communicating pipelines leak outwards are solved.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine manufacturing, in particular to a front end arrangement of a V12 common rail diesel engine. Background Art

[0002] The V12 high-power diesel engine invented this time is a heavy-duty diesel engine with a displacement of 24L and a power of 900kw. The V-shaped angle is 90°, and the power output is from the rear flywheel. Heavy-duty diesel engines have high power, high fuel consumption, and long water and oil channels, which will correspondingly bring about high heat dissipation requirements, high requirements for terminal oil pressure for shaft lubrication, large water pump flow, large oil pump flow, large oil radiator heat dissipation power requirements, and high oil filter flow requirements.

[0003] In the field of heavy-duty diesel engine design, the existing technology designs the front end of the diesel engine as a platform for carrying cooling and lubrication systems, and the space required for the components of the cooling and lubrication systems is discretely distributed. The components that involve liquid transfer of coolant and engine oil are connected using external pipes.

[0004] There are three obvious defects in the existing technology: On the one hand, heavy-duty diesel engines have high demands on cooling and lubrication systems. The components of each system, especially the performance parts, are large in size. The use of a decentralized layout will require a large amount of space at the front end of the diesel engine, making it impossible to achieve a centralized layout, and even multiple layers of overlapping layout may occur, which brings many disadvantages to assembly and maintenance.

[0005] On the other hand, the coolant and engine oil need to be transferred between the distributed components, which requires the arrangement of multiple external liquid pipelines. This poses a major challenge to the reliability of the liquid seal at the front end of the entire machine. Under the impact of high and low temperatures and various harsh operating environments, the possibility of liquid leakage is very high.

[0006] Finally, the front-end structure of the diesel engine, which is arranged with a large number of parts, is very fragile. When encountering abnormal external force impact, liquid leakage is likely to occur, causing the diesel engine to be forced to shut down, causing the reliability of the diesel engine to be seriously reduced. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a special heavy-duty diesel engine front end layout, which solves the problems that the components of the cooling system and the lubrication system cannot be arranged in a centralized manner, the front end components have a large space layout, and the liquid connecting pipes leak a lot.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: A front end arrangement of a V12 common rail diesel engine is provided, wherein a front transmission case is arranged on the periphery of a crankshaft, components required for a cooling system and a lubrication system of the diesel engine are centrally arranged on the front transmission case, a reserved front end power output port is provided on the front transmission case for a flywheel end to output the main power; a built-in water cavity, a main oil channel and an embedded oil collecting chamber are provided in the front transmission case; a through hole for the crankshaft to pass through is provided at the lower part of the front transmission case, and an intermediate transmission gear is provided at the upper end of the through hole.

[0009] A further improvement of the technical solution of the present invention is that: the cooling system includes a high-power water pump that provides power for the cooling system; a bevel gear is installed at the end of the impeller shaft on the high-power water pump, and the bevel gear is meshed with the intermediate transmission gear for transmission; a water pump inlet connected to the liquid inlet of the high-power water pump is arranged on one side of the upper end of the front transmission case; an upper water chamber and a water outlet chamber are arranged in parallel at the water outlet end of the high-power water pump.

[0010] A further improvement of the technical solution of the present invention is that the working process of the cooling system is as follows: After the high-power water pump rotates, it drives the coolant to be pumped in from the water inlet of the water pump, passes through the upper water chamber and the water outlet chamber at the water outlet end of the high-power water pump, and one path of the coolant coming out of the water outlet chamber directly enters one side of the V-shaped crankcase for cooling, and the other path of the coolant coming out of the upper water chamber after pressure buildup goes upward from the built-in water chamber of the front transmission case into the sealed space formed by the oil radiator cover in the lubrication system to cool the oil radiator. After cooling, it enters the other side of the V-shaped crankcase from the built-in water chamber on the other side of the front transmission case in a diagonal manner for cooling.

[0011] A further improvement of the technical solution of the present invention is that the overall temperature of the coolant after passing through the oil radiator is 3° C. higher than the temperature of the original coolant.

[0012] A further improvement of the technical solution of the present invention is that: the lubrication system includes an oil pump, an oil radiator, an oil radiator cover, an oil filter seat, an oil filter, a main oil channel pressure limiting valve and an oil pipeline; the oil pump is arranged one on each side of the through hole of the front transmission case; the oil radiator is arranged at the top of the front transmission case; the oil radiator cover is arranged on the outside of the oil radiator; the oil filter seat is arranged on one side of the lower end of the oil radiator; two oil filters are installed in parallel on the oil filter seat; and the main oil channel pressure limiting valve is arranged on the main oil channel of the front transmission case.

[0013] A further improvement of the technical solution of the present invention is that the oil filter is arranged in parallel in an integrated manner.

[0014] A further improvement of the technical solution of the present invention is that the oil filter is installed in parallel using a quick-release structure.

[0015] A further improvement of the technical solution of the present invention is that the working process of the lubrication system is as follows: The oil of the lubrication system is sucked into the oil pump from the oil pan through the oil pump driven by the front end gear of the crankshaft, and the oil pressurized by the oil pump enters from the main oil channel inlet of the front transmission case after being merged through the Y-shaped pipe; the pressurized oil passing through the main oil channel pressure limiting valve is divided into two oil outlets from the built-in oil collecting chamber built into the front transmission case through one main oil channel, and enters the oil radiator through the form of O-ring end face seals respectively; The oil in the oil radiator realizes convection heat exchange with the coolant sealed by the oil radiator cover and cools down before flowing into the built-in oil collecting chamber on the other side of the front transmission case again, so that the two oil outlets of the oil radiator are reunited at the main oil channel of the front transmission case; The cooled oil after merging into the main oil channel flows from the main oil channel into the oil filter seat, and the oil is filtered by two oil filters arranged in parallel through the built-in oil channel of the oil filter seat; The filtered, cooled and clean engine oil flows from the built-in main oil channel of the front transmission case in a 90-degree right-angle turn and in a direction parallel to the crankshaft axis from the main oil channel outlet of the front transmission case into the crankcase main oil channel for lubrication and cooling needs, thereby achieving the final functions of pressure building, cooling, filtering and pressure limiting of the engine oil in the lubrication system.

[0016] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: Compared with the existing distributed and discretely arranged front-end components for cooling and lubrication systems to realize functions, the present invention has a compact structure and greatly shortens the axial size of the diesel engine; there are very few leaking components, which reduces the number of sealing components used and the probability of failure; all built-in fluid cavities eliminate the risk of leakage of external coolant and oil pipelines; the embedded component layout greatly reduces the possibility of damage and failure of various components caused by external abnormal external forces and collisions; a better lightweight design of the whole machine can be achieved, the structural size of the whole machine can be greatly reduced, and the market competitiveness of the whole machine product is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 Schematic diagram of the front end layout of a V12 common rail diesel engine provided in an embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the front end layout of a V12 common rail diesel engine provided in an embodiment of the present invention Figure 2 ; Figure 3 Schematic diagram of the front end layout of a V12 common rail diesel engine provided in an embodiment of the present invention Figure 3 ; Figure 4 Schematic diagram of the front end layout of a V12 common rail diesel engine provided in an embodiment of the present invention Figure 4 ; Figure 5 Schematic diagram of the front end layout of a V12 common rail diesel engine provided in an embodiment of the present invention Figure 5 ; Among them, 1. Front transmission case; 1-1. Built-in oil collecting chamber; 1-2. Main oil channel inlet; 1-3. Main oil channel outlet; 1-4. Through hole; 2. Reserved front end power output port; 3. Oil radiator; 4. Oil radiator cover; 5. High-power water pump; 5-1. Upper water chamber; 5-2. Water outlet chamber; 6. Oil filter seat; 7. Oil filter; 8. Water pump inlet; 9. Main oil channel pressure limiting valve; 10. Intermediate transmission gear; 11. Oil pump; 11-1. Oil pump inlet. DETAILED DESCRIPTION

[0018] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatuses.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] The present invention is further described in detail below with reference to the accompanying drawings and embodiments: like Figure 1-5As shown, a front end arrangement of a V12 common rail diesel engine is provided, a front transmission case 1 is provided on the periphery of the crankshaft, and the components required for the cooling system and lubrication system of the diesel engine are centrally arranged on the front transmission case 1. A reserved front end power output port 2 is provided on the front transmission case 1 for the flywheel end to output the main power; a built-in water cavity, a main oil channel (with a main oil channel inlet 1-2 and a main oil channel outlet 1-3) and an embedded oil collecting chamber 1-1 are provided in the front transmission case 1; a through hole 1-4 for the crankshaft to pass through is provided at the lower part of the front transmission case 1, and an intermediate transmission gear 10 is provided at the upper end of the through hole 1-4. The main oil channel inlet 1-2 of the main oil channel is provided on one side of the mounting hole of the intermediate transmission gear 10, and the main oil channel outlet 1-3 of the main oil channel is provided at the upper end of the oil filter seat 6.

[0021] Power output method: the front end gear of the crankshaft drives the two oil pumps 11 arranged on the left and right sides of the through hole 1-4 and the intermediate transmission gear 10 arranged on the upper end of the through hole 1-4. The intermediate transmission gear 10 drives the gear of the high-power water pump 5 arranged on the upper end of the front transmission box 1 and the flywheel power output end passing through the reserved front end power output port 2.

[0022] In the present invention, the decorative cooling system and the lubrication system are highly integrated and arranged on the front transmission case 1, with a compact appearance and shortened axial dimensions of the whole machine; all of them adopt cast or machined built-in fluid cavities, without the risk of leakage of external fluid pipelines; gears drive the operation of each gear train, with high efficiency and high reliability; very few parts leak out and contact the sealing surface, reducing the number of leakage points and the number of sealing parts used; the accompanying structure gear oil pump is arranged, which greatly saves the layout space of the whole machine.

[0023] Furthermore, the cooling system includes a high-power water pump 5 and various O-rings for sealing, etc., which provide power for the cooling system; a bevel gear is installed at the end of the impeller shaft on the high-power water pump 5, and the bevel gear is meshed with the intermediate transmission gear 10 for transmission; a water pump inlet 8 connected to the liquid inlet of the high-power water pump 5 is arranged on one side of the upper end of the front transmission box 1; an upper water chamber 5-1 and a water outlet chamber 5-2 are arranged in parallel at the water outlet of the high-power water pump 5.

[0024] Further, the working process of the cooling system is as follows: After the high-power water pump 5 rotates, it drives the coolant to be pumped in from the water pump inlet 8, and passes through the upper water chamber 5-1 and the water outlet chamber 5-2 at the water outlet end of the high-power water pump 5. One path of the coolant coming out of the water outlet chamber 5-2 directly enters one side of the V-shaped crankcase for cooling, and the other path of the coolant coming out of the upper water chamber 5-1 after built-up pressure enters upward from the built-in water chamber of the front transmission case 1 into the sealed space formed by the oil radiator cover 4 in the lubrication system to cool the oil radiator 3. After cooling, it enters the other side of the V-shaped crankcase in a diagonal manner from the built-in water chamber on the other side of the front transmission case 1 for cooling.

[0025] Furthermore, according to calculation, the overall temperature of the coolant after passing through the oil radiator 3 is only 3° C. higher than the temperature of the original coolant, which has no effect on the normal operation of the cylinders on both sides of the V-type diesel engine.

[0026] Furthermore, the lubrication system includes an oil pump 11, an oil radiator 3, an oil radiator cover 4, an oil filter seat 6, an oil filter 7, a main oil channel pressure limiting valve 9, an oil pipeline, and various sealing oil seals and O-rings, etc.; an oil pump 11 is provided on each side of the through hole 1-4 of the front transmission case 1; the oil radiator 3 is provided at the top of the front transmission case 1; the oil radiator cover 4 is provided on the outside of the oil radiator 3; the oil filter seat 6 is provided on one side of the lower end of the oil radiator 3; two oil filters 7 are installed in parallel on the oil filter seat 6; and the main oil channel pressure limiting valve 9 is provided on the main oil channel of the front transmission case 1. An oil pump oil inlet 11-1 is provided on each side of the lower end of the through hole 1-4 of the front transmission case 1.

[0027] Furthermore, the oil filter 3 is arranged in an integrated parallel manner; Furthermore, the oil filter 7 is installed in parallel with a quick-release structure; the oil filter 3 is arranged externally, which is convenient for maintenance.

[0028] Further, the working process of the lubrication system is as follows: The oil of the lubrication system is sucked into the oil pump 11 from the oil pan through the oil pump 11 driven by the front gear of the crankshaft. The oil pressurized by the oil pump 11 enters from the main oil channel inlet 12 of the front transmission case after being merged through the Y-shaped pipe; the pressurized oil passing through the main oil channel pressure limiting valve 9 is divided into two oil outlets from the built-in oil collecting chamber 1-1 built into the front transmission case 1 through one main oil channel, and enters the oil radiator 3 through the form of O-ring end face sealing respectively; The oil in the oil radiator 3 realizes convection heat exchange with the coolant sealed by the oil radiator cover 4 and cools down before flowing into the built-in oil collecting chamber 1-1 built into the other side of the front transmission case 1 again, so that the two oil outlets of the oil radiator 3 are reunited in the main oil channel of the front transmission case 1; The cooled oil after merging into the main oil channel flows from the main oil channel into the oil filter seat 6, and the oil is filtered by two oil filters 7 arranged in parallel through the built-in oil channel of the oil filter seat 6; The filtered, cooled and clean engine oil flows from the built-in main oil channel of the front transmission case 1 in the form of a 90-degree right-angle turn and in a direction parallel to the crankshaft axis from the front transmission case main oil channel outlet 1-3 into the crankcase main oil channel for lubrication and cooling needs, thereby achieving the final functions of pressure building, cooling, filtering and pressure limiting of the engine oil in the lubrication system.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A front end arrangement of a V12 common rail diesel engine, characterized in that: A front transmission case (1) is arranged on the outer periphery of the crankshaft, and the components required for the cooling system and lubrication system of the diesel engine are centrally arranged on the front transmission case (1). A reserved front power output port (2) is arranged on the front transmission case (1) for the flywheel end to output the main power; a built-in water cavity, a main oil channel and an embedded oil collecting chamber (1-1) are arranged in the front transmission case (1); a through hole (1-4) for the crankshaft to pass through is arranged at the lower part of the front transmission case (1), and an intermediate transmission gear (10) is arranged at the upper end of the through hole (1-4).

2. A V12 common rail diesel engine front end arrangement according to claim 1, characterized in that: The cooling system comprises a high-power water pump (5) for providing power for the cooling system; a bevel gear is mounted on the end of the impeller shaft of the high-power water pump (5), and the bevel gear is meshed with the intermediate transmission gear (10) for transmission; a water pump water inlet (8) connected to a liquid inlet of the high-power water pump (5) is arranged on one side of the upper end of the front transmission case (1); an upper water chamber (5-1) and a water outlet chamber (5-2) are arranged in parallel at the water outlet of the high-power water pump (5).

3. A V12 common rail diesel engine front end arrangement according to claim 2, characterized in that: The working process of the cooling system is as follows: The high-power water pump (5) rotates to drive the coolant to be pumped in from the water pump inlet (8) and through the upper water chamber (5-1) and the water outlet chamber (5-2) at the water outlet end of the high-power water pump (5). One channel of the coolant coming out of the water outlet chamber (5-2) directly enters one side of the V-shaped crankcase for cooling. Another channel of the coolant coming out of the upper water chamber (5-1) after pressure buildup enters upward from the built-in water chamber of the front transmission case (1) into the sealed space formed by the oil radiator cover (4) in the lubrication system to cool the oil radiator (3). After cooling, the coolant enters the other side of the V-shaped crankcase in a diagonal manner from the built-in water chamber on the other side of the front transmission case (1) for cooling.

4. A V12 common rail diesel engine front end arrangement according to claim 3, characterized in that: The overall temperature of the coolant after passing through the oil radiator (3) is 3°C higher than the original coolant temperature.

5. A V12 common rail diesel engine front end arrangement according to claim 1, characterized in that: The lubrication system comprises an oil pump (11), an oil radiator (3), an oil radiator cover (4), an oil filter seat (6), an oil filter (7), a main oil channel pressure limiting valve (9) and an oil pipeline; the oil pump (11) is arranged one on each side of the through hole (1-4) of the front transmission case (1); the oil radiator (3) is arranged at the top of the front transmission case (1); the oil radiator cover (4) is arranged on the outside of the oil radiator (3); the oil filter seat (6) is arranged on one side of the lower end of the oil radiator (3); two oil filters (7) are installed in parallel on the oil filter seat (6); and the main oil channel pressure limiting valve (9) is arranged on the main oil channel of the front transmission case (1).

6. A V12 common rail diesel engine front end arrangement according to claim 5, characterized in that: The oil filter (3) is arranged in an integrated parallel manner.

7. A V12 common rail diesel engine front end arrangement according to claim 5, characterized in that: The oil filter (7) is installed in parallel using a quick-release structure.

8. A V12 common rail diesel engine front end arrangement according to claim 5, characterized in that: The working process of the lubrication system is as follows: The oil of the lubrication system is sucked into the oil pump (11) from the oil pan via the oil pump (11) driven by the front end gear of the crankshaft, and the pressurized oil of the oil pump (11) enters from the main oil channel inlet (12) of the front transmission case after being merged through the Y-shaped pipe; the pressurized oil passes through the main oil channel pressure limiting valve (9) and is divided into two oil outlets from a main oil channel through the built-in oil collecting chamber (1-1) of the front transmission case (1), and enters the oil radiator (3) respectively through the form of O-ring end face seals; The engine oil in the engine oil radiator (3) realizes heat exchange by convection with the coolant sealed by the engine oil radiator cover (4) and then flows into the built-in oil collecting chamber (1-1) on the other side of the front transmission case (1) after cooling down, so that the two engine oil outlets of the engine oil radiator (3) are reunited in the main oil channel of the front transmission case (1); The cooled oil after merging into the main oil channel flows from the main oil channel into the oil filter seat (6), and is filtered by two parallel-connected oil filters (7) through the built-in oil channel of the oil filter seat (6); The filtered, cooled and cleaned engine oil flows from the main oil passage built into the front transmission case (1) in a 90-degree right-angle turn in a direction parallel to the crankshaft axis from the main oil passage outlet (1-3) of the front transmission case into the main oil passage of the crankcase for lubrication and cooling needs, thereby achieving the functions of pressure building, cooling, filtering and pressure limiting of the engine oil in the final lubrication system.

Images