High-power diesel engine lubricating system

Abstract

The invention discloses a high-power diesel engine lubricating system, which belongs to the technical field of diesel engines and comprises a first oil pump and a second oil pump which are arranged in a diesel engine accessory bracket in parallel and are both pressure oil pumps. The first engine oil pump and the second engine oil pump suck engine oil through independent oil suction pipes correspondingly, and the pressure of the engine oil at oil outlets of the first engine oil pump and the second engine oil pump is the same. An oil outlet of the second oil pump is connected to an oil outlet of the first oil pump to form a confluence outlet; the engine oil radiator is formed by connecting a first engine oil radiator and a second engine oil radiator which are the same in structure into a whole in parallel through a flange, and the engine oil radiator is integrally installed at the upper end of the diesel engine accessory bracket. The left oil pump and the right oil pump which are independent are adopted to superpose flow, the two oil radiators are transversely connected to meet the requirement for the lubricating performance of the whole machine, the structure of the diesel engine is more compact, and a larger arrangement space is reserved for the whole machine.

Description

Technical Field

[0001] This invention relates to the field of diesel engine technology, and in particular to a lubrication system for a high-power diesel engine. Background Technology

[0002] As an important power machine, the lubrication system of a diesel engine is crucial for ensuring its reliable operation and service life. The lubrication system mainly consists of core components such as the oil pump, oil filter, and oil cooler. Its function is to lubricate, clean, dissipate heat, and prevent rust on the various friction pairs inside the engine by pumping oil.

[0003] As modern diesel engines evolve towards higher power, lower emissions, and compact designs, higher demands are placed on the performance of lubrication systems. In existing technologies, to meet the increased heat dissipation and lubrication requirements of high-power diesel engines, methods typically involve improving the performance of individual components. Specifically, for oil pumps, this is generally achieved by increasing pump volume, pump diameter, and the diameter of the oil inlet to improve oil pressure and flow rate. For oil coolers, the main approach is to increase the number of layers of internal cooling fins to increase the heat dissipation area, thereby improving overall heat dissipation performance. Building upon this foundation, the oil pump, oil filter, and oil cooler are then redesigned and matched to attempt to meet the performance specifications of the entire engine's lubrication system.

[0004] However, the aforementioned existing technologies have significant drawbacks in practical implementation. First, limited by the confined installation space within the diesel engine accessory bracket, simply increasing the physical size of the oil pump to improve performance is nearing its limit; the performance improvement of a single oil pump is insufficient to meet the ever-increasing demands for lubrication flow and pressure. Second, due to strict constraints on the overall engine shape and size, the height of the oil cooler is typically not allowed to be increased, rendering the traditional method of increasing the number of fin layers to improve heat dissipation no longer feasible. Therefore, while pursuing high-performance components, existing technological solutions cannot simultaneously address the stringent constraints of the overall engine installation space and the connection requirements with surrounding parts, thus hindering further compaction and performance optimization of high-pressure common rail high-power diesel engines. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a high-power diesel engine lubrication system, which uses two independent oil pumps on the left and right to superimpose the flow and connects two oil coolers laterally to meet the lubrication performance requirements of the whole engine, making the diesel engine structure more compact and reserving more layout space for the whole vehicle.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A high-power diesel engine lubrication system includes a first oil pump and a second oil pump arranged side by side in a diesel engine accessory bracket, both of which are pressure oil pumps; the first oil pump and the second oil pump respectively draw in oil through independent oil suction pipes, and the oil pressure at their oil outlets is the same; the oil outlet of the second oil pump is connected to the oil outlet of the first oil pump to form a confluence outlet.

[0007] A further improvement of the technical solution of the present invention is that the lubrication system further includes an oil cooler, which is composed of a first oil cooler and a second oil cooler with the same structure connected in parallel by a flange and installed as a whole on the upper end of the diesel engine accessory bracket.

[0008] A further improvement of the technical solution of the present invention is that: the outer sides of the first oil cooler and the second oil cooler are covered with oil cooler covers, and the internal flow channels are filled with coolant for heat exchange.

[0009] A further improvement of the technical solution of the present invention is that the coolant flow channels of the first oil cooler and the second oil cooler are arranged in parallel and are connected together to the cooling circulation system of the diesel engine.

[0010] A further improvement of the technical solution of the present invention is that the lubrication system further includes an oil filter disposed on the diesel engine accessory bracket, for receiving and filtering the cooling oil from the oil cooler, and then delivering it to the main oil passage to lubricate the moving parts.

[0011] A further improvement of the technical solution of the present invention is that the oil filter is equipped with a bypass element for monitoring the pressure difference across the oil filter and maintaining sufficient oil supply to the diesel engine when the pressure difference exceeds a preset value.

[0012] A further improvement of the technical solution of the present invention is that: the oil suction pipe includes a first oil suction pipe and a second oil suction pipe; the first oil suction pipe is connected to the inlet of the first oil pump, the second oil suction pipe is connected to the inlet of the second oil pump, and the two oil suction pipes are arranged independently.

[0013] A further improvement of the technical solution of the present invention is that: the first oil pump and the second oil pump are synchronously driven by the same drive shaft through a gear transmission mechanism, and the drive shaft is linked to the crankshaft or camshaft of the diesel engine.

[0014] A further improvement of the technical solution of the present invention is that the confluence outlet is realized through a three-way structure, the two inlets of which are respectively connected to the oil outlets of the first oil pump and the second oil pump, and its outlet leads to the inlet of the oil cooler.

[0015] A further improvement of the technical solution of the present invention is that the lubrication system further includes a pressure regulating system installed on the diesel engine accessory bracket. This system is configured to open the safety valve to release pressure when the oil pressure at the manifold outlet reaches a certain limit, so as to meet the normal lubrication requirements of the diesel engine.

[0016] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows: 1. The lubrication system provided by this invention meets the requirements of an oil pump flow rate of not less than 410 L / min and an oil heat dissipation of not less than 100 kW. It not only meets the performance requirements of the lubrication system for a diesel engine with a power of 900 kW, but also makes reasonable use of the overall assembly space, making the overall structure more compact and creating favorable conditions for vehicle layout. It also meets the overall requirements of the engine for lubricating oil pressure and temperature.

[0017] 2. The lubrication system provided by this invention has a large oil flow rate and good heat dissipation performance, which can meet the lubrication requirements of high-power diesel engines.

[0018] 3. The lubrication system provided by this invention has a reasonable and compact overall structure, occupies less space, and is suitable for the layout requirements of the vehicle. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the installation of the oil pump and oil cooler in an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of the oil pump suction pipe and oil filter in an embodiment of the present invention; Figure 3 This is a schematic diagram of the oil cooler structure in an embodiment of the present invention; The components include: 1. Diesel engine accessory bracket; 2. First oil pump; 3. Second oil pump; 4. Combination outlet; 5. First oil cooler; 6. Second oil cooler; 7. Oil cooler cover; 8. First oil suction pipe; 9. Second oil suction pipe; and 10. Oil filter. Detailed Implementation

[0020] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," 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 element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: like Figure 1 As shown, a high-power diesel engine lubrication system includes a first oil pump 2 and a second oil pump 3 arranged side by side in a diesel engine accessory bracket 1. Both are pressure oil pumps. The first oil pump 2 and the second oil pump 3 respectively draw in oil through independent oil suction pipes, and the oil pressure at their oil outlets is the same. The oil outlet of the second oil pump 3 is connected to the oil outlet of the first oil pump 2 to form a confluence outlet 4.

[0024] Specifically, diesel engines typically employ a single-stage oil pump or a combination of a single-stage oil pump and a return oil pump. A few diesel engines use a two-stage oil pump structure, where two oil pumps are connected in series. This means that the oil pressurized by the first pump is introduced into the second pump for secondary pressurization to meet the overall lubrication requirements of the diesel engine.

[0025] This invention features two oil pumps, one on the left and one on the right, both of which are pressure pumps, arranged within the diesel engine accessory bracket 1. This design optimizes space utilization by repositioning a pressure pump in the original return pump location. Each pump draws oil into its pump chamber via an independent suction pipe. As the master and slave gears rotate within the pump body, the oil is pressurized. The oil pressure at the outlets of both pumps is identical. The two pumps are connected by inserting the oil outlet of the right pump into the outlet of the left pump, allowing the oil flow rates of both pumps to be superimposed and merged. This increases the overall oil flow rate without loss of pressure. The oil then flows through an oil passage on the diesel engine accessory bracket 1 into the oil cooler for cooling, thus meeting the overall lubrication requirements of the engine.

[0026] Furthermore, such as Figure 1 , Figure 3 As shown, the lubrication system also includes an oil cooler, which is a first oil cooler 5 and a second oil cooler 6 with the same structure connected in parallel by a flange and installed as a whole on the upper end of the diesel engine accessory bracket 1.

[0027] Specifically, this oil cooler is designed to be used as a single unit by horizontally integrating two first oil coolers 5 and a second oil cooler 6 when the height of the oil cooler is limited. This not only meets the requirements of limited assembly space but also ensures that the heat dissipation capacity of the oil cooler is improved, so that the temperature of the lubricating oil of the whole machine is maintained within a reasonable range, while reducing the complexity of assembling multiple parts.

[0028] Furthermore, such as Figure 1 As shown, the first oil cooler 5 and the second oil cooler 6 are covered by oil cooler covers 7, and the internal flow channels are filled with coolant for heat exchange. The oil is cooled and kept within a reasonable range by the opposing flow of oil inside the oil cooler and external coolant.

[0029] Furthermore, the coolant flow channels of the first oil cooler 5 and the second oil cooler 6 are arranged in parallel and are connected together to the cooling circulation system of the diesel engine.

[0030] Furthermore, such as Figure 2 As shown, the lubrication system also includes an oil filter 10 mounted on the diesel engine accessory bracket 1, which receives and filters the cooled oil from the oil cooler, and then delivers it to the main oil passage to lubricate the moving parts. The oil cooled by the oil cooler enters the oil filter 10, is filtered, and then enters the main oil passage to lubricate the relevant moving parts of the entire machine.

[0031] Furthermore, the oil filter 10 is equipped with a bypass element to monitor the pressure difference across the oil filter 10 and maintain sufficient oil supply to the diesel engine when the pressure difference exceeds a preset value.

[0032] Furthermore, such as Figure 2 As shown, the oil suction pipe includes a first oil suction pipe 8 and a second oil suction pipe 9; the first oil suction pipe 8 is connected to the inlet of the first oil pump 2, and the second oil suction pipe 9 is connected to the inlet of the second oil pump 3. The two oil suction pipes are arranged independently. The bottoms of the first oil suction pipe 8 and the second oil suction pipe 9 are placed inside the oil pan of the diesel engine.

[0033] Furthermore, the first oil pump 2 and the second oil pump 3 are synchronously driven by the same drive shaft through a gear transmission mechanism, and this drive shaft is linked to the crankshaft or camshaft of the diesel engine.

[0034] Furthermore, such as Figure 1 As shown, the manifold outlet 4 is achieved through a three-way structure. The two inlets of this three-way structure are respectively connected to the oil outlets of the first oil pump 2 and the second oil pump 3, and its outlet leads to the inlet of the oil cooler. The three-way structure is part of the oil pump.

[0035] Furthermore, the lubrication system also includes a pressure regulating system installed on the diesel engine accessory bracket 1. This system is configured to open the safety valve to release pressure when the oil pressure at the manifold outlet 4 reaches a certain limit, so as to meet the normal lubrication requirements of the diesel engine.

[0036] In summary, the lubrication system provided by this invention meets the requirements of an oil pump flow rate of not less than 410 L / min and an oil heat dissipation of not less than 100 kW. It not only satisfies the performance requirements of the lubrication system for a diesel engine with a power output of 900 kW, but also makes reasonable use of the overall assembly space, resulting in a more compact overall structure and creating favorable conditions for vehicle layout. Furthermore, it meets the overall requirements of the engine for lubricating oil pressure and temperature.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 high-power diesel engine lubrication system, characterized in that: It includes a first oil pump (2) and a second oil pump (3) arranged side by side in the diesel engine accessory bracket (1), both of which are pressure oil pumps; the first oil pump (2) and the second oil pump (3) respectively draw in oil through independent oil suction pipes, and the oil pressure at the oil outlet of the two is the same; the oil outlet of the second oil pump (3) is connected to the oil outlet of the first oil pump (2) to form a confluence outlet (4).

2. The high-power diesel engine lubrication system according to claim 1, characterized in that: The lubrication system also includes an oil cooler, which is a first oil cooler (5) and a second oil cooler (6) with the same structure connected in parallel by a flange and installed as a whole on the upper end of the diesel engine accessory bracket (1).

3. The high-power diesel engine lubrication system according to claim 2, characterized in that: The first oil cooler (5) and the second oil cooler (6) are covered with an oil cooler cover (7), and the internal flow channels are filled with coolant for heat exchange.

4. A high-power diesel engine lubrication system according to claim 2, characterized in that: The coolant channels of the first oil cooler (5) and the second oil cooler (6) are arranged in parallel and are connected to the cooling circulation system of the diesel engine.

5. A high-power diesel engine lubrication system according to claim 1, characterized in that: The lubrication system also includes an oil filter (10) mounted on the diesel engine accessory bracket (1) for receiving and filtering the cooling oil from the oil cooler, which is then delivered to the main oil passage to lubricate the moving parts.

6. A high-power diesel engine lubrication system according to claim 5, characterized in that: The oil filter (10) is equipped with a bypass element for monitoring the pressure difference across the oil filter (10) and maintaining sufficient oil supply to the diesel engine when the pressure difference exceeds a preset value.

7. A high-power diesel engine lubrication system according to claim 1, characterized in that: The oil suction pipe includes a first oil suction pipe (8) and a second oil suction pipe (9); the first oil suction pipe (8) is connected to the inlet of the first oil pump (2), and the second oil suction pipe (9) is connected to the inlet of the second oil pump (3). The two oil suction pipes are arranged independently.

8. A high-power diesel engine lubrication system according to claim 1, characterized in that: The first oil pump (2) and the second oil pump (3) are synchronously driven by the same drive shaft through a gear transmission mechanism. The drive shaft is linked to the crankshaft or camshaft of the diesel engine.

9. A high-power diesel engine lubrication system according to claim 1, characterized in that: The confluence outlet (4) is achieved through a three-way structure. The two inlets of the three-way structure are respectively connected to the oil outlets of the first oil pump (2) and the second oil pump (3), and its outlet leads to the inlet of the oil cooler.

10. A high-power diesel engine lubrication system according to claim 1, characterized in that: The lubrication system also includes a pressure regulating system installed on the diesel engine accessory bracket (1). This system is configured to open the safety valve to release pressure when the oil pressure at the manifold outlet (4) reaches a certain limit, so as to meet the normal lubrication requirements of the diesel engine.

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