A small horizontal two-cylinder diesel engine

Abstract

The invention discloses a small horizontal twin-cylinder diesel engine, which relates to the technical field of diesel engines. The engine comprises an engine body, wherein two horizontal inline cylinders are arranged in parallel inside the engine body, each of the cylinders has a diameter of 90 mm and a stroke of 75 mm, and each of the cylinders has a compression ratio of 19:1. A crankshaft output end is arranged inside the engine body, and a low-pressure pump is installed on the engine body. The diesel engine of the invention adopts light materials, ensures a good power-to-weight ratio (0.173 KW / Kg), ensures that the whole machine is small in size and light in weight, and effectively meets the needs of the market. The advanced and precise electronic speed control system can easily realize the conversion of multiple application modes, and the superior engine control capability ensures that the speed fluctuation rate of the engine is controlled within 0.3%, realizes 0 speed regulation, ensures the voltage stability of the equipped generator set, can realize the unchanged voltage value under no-load and load conditions, and improves and facilitates the fault maintainability of the speed control system.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engines, and in particular to a small horizontal double-cylinder diesel engine. Background Art

[0002] A diesel engine is a compression ignition internal combustion engine that uses diesel as fuel, commonly known as an engine, locomotive or oil engine.

[0003] The current diesel engines are found to have at least the following technical problems:

[0004] First, the existing diesel engines used for auxiliary power supply have deficiencies in the balance between power and volume. Although some diesel engines can provide sufficient power, they are too large to be installed in a limited space; while other smaller diesel engines cannot meet the power requirements of the equipment;

[0005] Second, during the installation of existing diesel engines, the installation of the diesel engine brackets and connecting parts usually lacks an effective positioning structure. During the installation process, it is often necessary to rely on the operator's experience and repeated adjustments and calibrations to determine the installation position, which is not only time-consuming and labor-intensive, but also prone to installation errors, affecting the installation accuracy and speed. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a small horizontal twin-cylinder diesel engine to solve the above-mentioned technical problems.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A small horizontal twin-cylinder diesel engine comprises a body, wherein two horizontal inline cylinders are arranged in parallel inside the body, each of the cylinders has a diameter of 90 mm and a stroke of 75 mm, and the compression ratio of each cylinder is 19:1. A crankshaft output end is arranged inside the body, a low-pressure pump is installed on the body, an intake pipe and a first exhaust pipe are arranged on the body, a muffler is installed on the body, the first exhaust pipe is connected to the muffler, and a second exhaust pipe is connected to the muffler. A flywheel fan end is arranged at one end of the body, an air filter is connected to the intake pipe for filtering the incoming air, an ECU system is arranged in the body, an oil filter is arranged on the oil circuit of the body, and a radiator is arranged at one end of the body near the flywheel fan end.

[0011] Preferably: brackets are fixedly connected to both sides of the bottom end of the body, a connecting part is provided under each bracket, a bolt is rotatably twisted into each bracket, each bracket is threadedly fixed to the connecting part by the bolt, a mounting groove is provided in the middle of the upper surface of each connecting part, a card groove is provided on the inner walls on both sides of each mounting groove, a through hole communicating with the mounting groove is provided on the surface of each bracket, a positioning assembly is provided on each bracket, the positioning assembly comprises a fixing frame, a mounting block and a fixing plate, the fixing frame is fixedly installed in the middle of the upper end of the bracket, and a receiving groove communicating with the through hole is provided on the surface of the fixing frame.

[0012] Preferably: an L-plate is movably inserted into both ends of the fixing frame, and threaded holes are provided on the surfaces of the two L-plates, and the thread directions of the two threaded holes are opposite, a threaded rod is rotatably installed on the fixing frame, and the threaded rod passes through the two threaded holes, and both ends of the threaded rod are fixedly connected to a handwheel, and both ends of the fixing frame are fixedly connected to a support block, and the two L-plates are slidably installed on the upper ends of the support block, and the two L-plates are fixedly connected with a contact block 1, and the mounting blocks are slidably installed in the accommodating groove and movably pass through the through hole, and two sliding rods are slidably installed in the mounting block, and the ends of the two sliding rods are fixedly connected with a clamping block, and the two sliding rods are fixedly connected with a spring 1, and the two sliding rods are fixedly connected to the inner wall of the mounting block through the spring 1.

[0013] Preferably: the bottom end of the mounting block is inserted into the mounting groove, the two card blocks are movably inserted into the card slots respectively, the upper end of each sliding rod is fixedly connected with a contact block 2, a push block is arranged between the two contact blocks 2, the surfaces of the push block fitting with the two contact blocks 2 are of inclined design, the upper end of the push block is fixedly connected with a fixing rod, both ends of the fixing rod are fixedly connected with contact blocks 3, the two contact blocks 3 are respectively fitted with the surfaces of the two contact blocks 1, and the fitting surfaces are of inclined design.

[0014] Preferably: the fixing plate is fixedly mounted on the upper end of the mounting block, a spring 2 is fixedly connected between the fixing plate and the fixing rod, a limiting rod is fixedly connected to the fixing plate, the limiting rod movably passes through the fixing rod, an annular groove is arranged in the fixing frame, a limiting ring is fixedly mounted on the threaded rod, and the limiting ring is arranged in the annular groove.

[0015] (III) Beneficial effects

[0016] 1. This diesel engine solves the problem of matching the power and volume of the auxiliary power supply on the vehicle, fills the gap in the domestic 10-20Kw power range of horizontal air-cooled diesel engines, broadens the application field of two-cylinder diesel engines, accelerates the development of two-cylinder diesel engine series, improves the technological content and grade of the engine, and obtains greater market and economic benefits.

[0017] Second: The diesel engine adopts light materials to ensure a good power-to-weight ratio (0.173KW / Kg), ensuring that the whole machine is small in size and light in weight, effectively meeting the market demand. The advanced and precise electronic speed control system can easily realize the conversion of various application modes. The superior engine control capability ensures that the engine speed fluctuation rate is controlled within 0.3%, achieving 0 speed regulation rate, ensuring the voltage stability of the installed generator set, and can achieve the same voltage value under no-load and load conditions, improving and facilitating the fault maintenance of the speed control system.

[0018] Three: The two L plates are moved closer to each other by rotating the threaded rod, so that the two L plates are inserted into the receiving groove, and the position of the mounting block is limited and blocked. At this time, the mounting block passes through the through hole, and the bottom end of the mounting block extends out of the bracket to form a positioning portion. The mounting block is aligned with the mounting groove and inserted into it to complete the positioning connection between the bracket and the connecting portion, thereby positioning the installation of the bracket, making the insertion of the bolts more convenient and quick, reducing the adjustment and calibration time during the installation process, and further improving the installation speed, making the installation of the diesel engine more convenient, and when not installed, the mounting block can be retracted into the receiving groove, so that the bottom of the bracket can be flush, ensuring that the diesel engine can be placed stably on the ground, which can not only meet the positioning requirements during installation, but also remain stable during disassembly and placement, and adapt to a variety of usage scenarios.

[0019] Fourth: By inserting the mounting block into the mounting groove, the blocking force between the bracket and the connecting part is increased, the impact resistance is enhanced, and the diesel engine can better withstand and disperse the impact force when it is impacted in the horizontal direction, protecting the connecting parts and internal structures from damage.

[0020] Five: When the two contact blocks 1 move closer to each other, a force is applied to the two contact blocks 3, so that the fixed rod moves, and the movement of the fixed rod drives the push block to move. The movement of the push block applies a force to the two contact blocks 2, so that the two contact blocks 2 move away from each other. The movement of the two contact blocks 2 away from each other drives the two card blocks to move away from each other, so that the two card blocks are respectively inserted into the card slots. At this time, the mounting block is blocked in the vertical direction, and the connection and fixation between the reinforcement bracket and the connecting part are improved, the firmness of the connection is improved, the risk of component failure or falling off due to loose connection is reduced, and the stable operation of the diesel engine is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0022] Figure 1It is the overall structural diagram of the small horizontal twin-cylinder diesel engine of the present invention;

[0023] Figure 2 It is a structural diagram of the air intake pipe of the present invention;

[0024] Figure 3 is a structural diagram of the air filter of the present invention;

[0025] Figure 4 It is a structural diagram of the ECU system of the present invention;

[0026] Figure 5 It is a structural diagram of the body of the present invention;

[0027] Figure 6 is a structural diagram of the support of the present invention;

[0028] Figure 7 It is a structural diagram of the installation block of the present invention;

[0029] Figure 8 is a structural diagram of a through hole of the present invention;

[0030] Fig. 9 is a structural diagram of the connecting portion of the present invention;

[0031] Fig.10 It is a structural diagram of the fixed frame of the present invention;

[0032] Fig.11 It is a structural diagram of the fixing rod of the present invention;

[0033] Fig.12 It is a structural diagram of a cutaway fixed frame of the present invention;

[0034] Fig.13 This is a structural diagram of a cutaway installation block of the present invention.

[0035] Legend: 1. Engine body; 11. Crankshaft output end; 12. Low-pressure pump; 13. Intake pipe; 14. First exhaust pipe; 15. Muffler; 16. Second exhaust pipe; 17. Flywheel fan end; 18. Air filter; 2. ECU system; 3. Oil filter; 4. Radiator; 5. Bracket; 51. Through hole; 6. Connecting part; 61. Mounting slot; 62. Clamping slot; 7. Fixing frame; 71. Receiving slot; 72. Support block; 73. L-plate; 74. Threaded rod; 75. Handwheel; 76. Contact block one; 77. Limiting ring; 8. Mounting block; 81. Sliding rod; 82. Clamping block; 83. Spring one; 84. Contact block two; 85. Pushing block; 86. Fixing rod; 87. Contact block three; 9. Fixing plate; 91. Spring two; 92. Limiting rod. DETAILED DESCRIPTION

[0036] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] Embodiment: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, in view of the problems existing in the prior art, the present invention provides a small horizontal twin-cylinder diesel engine, comprising a body 1, wherein two horizontal in-line cylinders are arranged in parallel inside the body 1, each cylinder having a diameter of 90 mm and a stroke of 75 mm. The parameter data of the small horizontal twin-cylinder diesel engine are shown in Table 1;

[0038] The compression ratio of each cylinder is 19:1. A crankshaft output end 11 is provided inside the engine body 1. A low-pressure pump 12 is installed on the engine body 1. An intake pipe 13 and a first exhaust pipe 14 are provided on the engine body 1. A muffler 15 is installed on the engine body 1. The first exhaust pipe 14 is connected to the muffler 15. The muffler 15 is connected to the second exhaust pipe 16. A flywheel fan end 17 is provided at one end of the engine body 1. An air filter 18 is connected to the intake pipe 13 for filtering the incoming air. An ECU system 2 is provided in the engine body 1. An oil filter 3 is provided in the oil circuit of the engine 1, a radiator 4 is provided at one end of the engine 1 near the flywheel fan end 17, a crankshaft output end 11 is connected to the transmission system of the engine and is responsible for outputting power, a low-pressure pump 12 is connected to the fuel supply system through a pipeline, a muffler 15 is used to discharge exhaust gas and reduce exhaust noise, and a flywheel fan end 17 cooperates with the flywheel to play a role in balancing and heat dissipation. The ECU system 2 is connected to various sensors and actuators of the engine through lines to achieve accurate monitoring of the working state of the engine. Control, the oil filter 3 is installed in the oil circuit of the engine body 1 to filter impurities in the oil, and the radiator 4 is connected to the cooling system of the engine through a pipeline to achieve heat dissipation of the engine. The diesel engine adopts light materials to ensure a good power-to-weight ratio (0.173KW / Kg), ensure that the whole machine is small in size and light in weight, and effectively meet the needs of the market. The advanced and precise electronic speed control system can easily realize the conversion of multiple application modes. The superior engine control ability ensures that the engine speed fluctuation rate is controlled within 0.3%, realizes 0 speed regulation, ensures the voltage stability of the equipped generator set, and can achieve the voltage value unchanged under no-load and load conditions, improves and facilitates the fault maintenance of the speed control system. The diesel engine solves the problem of matching the power and volume of the auxiliary power supply on the vehicle, fills the gap of the domestic 10-20Kw power range horizontal air-cooled diesel engine, broadens the use field of two-cylinder diesel engines, accelerates the development of two-cylinder diesel engine series, improves the scientific and technological content and grade of the engine, and obtains greater market and economic benefits;

[0039] Both sides of the bottom end of the body 1 are fixedly connected with brackets 5, and a connecting part 6 is provided under each bracket 5. A bolt is rotatably twisted into each bracket 5, and each bracket 5 is threadedly fixed to the connecting part 6 by the bolt. A mounting groove 61 is provided in the middle of the upper surface of each connecting part 6, and a clamping groove 62 is provided on the inner walls of both sides of each mounting groove 61. A through hole 51 communicating with the mounting groove 61 is provided on the surface of each bracket 5, and a positioning component is provided on each bracket 5. The positioning component includes a fixing frame 7, a mounting block 8 and a fixing plate 9. The fixing frame 7 is fixedly installed in the middle of the upper end of the bracket 5, and a receiving groove 71 communicating with the through hole 51 is provided on the surface of the fixing frame 7. L plates 73 are movably inserted at both ends of the fixing frame 7, and the surfaces of the two L plates 73 Both are provided with threaded holes, and the thread directions of the two threaded holes are opposite. A threaded rod 74 is rotatably installed on the fixed frame 7, and the threaded rod 74 passes through the two threaded holes. Both ends of the threaded rod 74 are fixedly connected to a hand wheel 75, and both ends of the fixed frame 7 are fixedly connected to a support block 72. Two L plates 73 are respectively slidably installed on the upper ends of the support blocks 72, and the two L plates 73 are fixedly connected to a contact block 76. The mounting block 8 is slidably installed in the accommodating groove 71 and movably passes through the through hole 51. Two sliding rods 81 are slidably installed in the mounting block 8, and the ends of the two sliding rods 81 are fixedly connected to a card block 82. The two sliding rods 81 are fixedly connected to a spring 83. The two sliding rods 81 are respectively fixedly connected to the inner wall of the mounting block 8 through the spring 83, and the bottom end of the mounting block 8 Inserted into the mounting groove 61, the two card blocks 82 are movably inserted into the card slots 62, the upper end of each slide bar 81 is fixedly connected with a contact block 2 84, a push block 85 is arranged between the two contact blocks 2 84, the surfaces where the push block 85 fits with the two contact blocks 2 84 are both inclined, the upper end of the push block 85 is fixedly connected with a fixing rod 86, both ends of the fixing rod 86 are fixedly connected with a contact block 3 87, the two contact blocks 3 87 fit with the surfaces of the two contact blocks 1 76 respectively, and the fitting surfaces are inclined, the fixing plate 9 is fixedly installed on the upper end of the mounting block 8, a spring 2 91 is fixedly connected between the fixing plate 9 and the fixing rod 86, a limiting rod 92 is fixedly connected to the fixing plate 9, the limiting rod 92 movably penetrates the fixing rod 86, and a fixing frame 7 is provided with An annular groove is provided, and a limiting ring 77 is fixedly installed on the threaded rod 74. The limiting ring 77 is set in the annular groove. In the initial state, the mounting block 8 is not blocked by the two L plates 73, so that the mounting block 8 can be retracted into the receiving groove 71 under force, so that the bracket 5 can stably contact the ground, so that the diesel engine can be stably placed on the ground. When the diesel engine needs to be installed, the hand wheel 75 is twisted to rotate the threaded rod 74, and the two L plates 73 are moved closer to each other through the rotation of the threaded rod 74, so that the two L plates 73 are inserted into the receiving groove 71, and the position of the mounting block 8 is limited and blocked. At this time, the mounting block 8 passes through the through hole 51, and the bottom end of the mounting block 8 extends out of the bracket 5 to form a positioning portion, and the mounting block 8 is aligned with the mounting groove 61 and inserted into it.The bracket 5 and the connecting part 6 are positioned and connected, thereby playing a positioning role in the installation of the bracket 5, making the insertion of the bolts more convenient and quick, reducing the adjustment and calibration time during the installation process, further improving the installation speed, making the installation of the diesel engine more convenient, and when not installed, the mounting block 8 can be retracted into the accommodating groove 71, so that the bottom of the bracket 5 can be flush, ensuring that the diesel engine can be stably placed on the ground, which can not only meet the positioning requirements during installation, but also remain stable during disassembly and placement, and adapt to a variety of usage scenarios. By inserting the mounting block 8 into the mounting groove 61, the horizontal blocking force between the bracket 5 and the connecting part 6 is increased, and the impact resistance is enhanced, ensuring that when the diesel engine is subjected to horizontal impact, it can better withstand and disperse the impact force, and protect the connection part and the internal structure from damage. After the bracket 5 and the connecting part 6 are connected and fixed, continue to twist the hand wheel 75 to make the threaded rod 74 continue to rotate, and the two L plates 73 are driven to continue to move closer to each other through the rotation of the threaded rod 74, and the two contact blocks 76 are driven to move closer to each other through the movement of the two L plates 73. The two contact blocks 1 76 move toward each other and exert a force on the two contact blocks 3 87, so that the fixing rod 86 moves. The movement of the fixing rod 86 drives the push block 85 to move. The movement of the push block 85 exerts a force on the two contact blocks 2 84, so that the two contact blocks 2 84 move away from each other. The two contact blocks 2 84 move away from each other and drive the two card blocks 82 to move away from each other, so that the two card blocks 82 are respectively inserted into the card slots 62. At this time, the mounting block 8 is blocked in the vertical direction, and the reinforcement bracket 5 and the connecting portion 6 are connected. The connection between them is fixed, which improves the firmness of the connection, reduces the risk of component failure or falling off due to loose connection, and ensures the stable operation of the diesel engine. The slide bar 81 is fixedly connected to the inner wall of the mounting block 8 through the spring 1 83, which plays a role in resetting the slide bar 81. The fixed rod 86 is fixedly connected to the fixed plate 9 through the spring 2 91, which plays a role in resetting the fixed rod 86. The limit rod 92 movably penetrates the fixed rod 86 and plays a role in limiting the movement of the fixed rod 86, so that it can only move in the horizontal direction. The structural design is reasonable.

[0040] Table 1: Parameter data of small horizontal two-cylinder diesel engine.

[0041] model. NE62P01F. Number of cylinders. 2 Working process. Four-stroke. Cylinder diameter x stroke (mm) 90×75. Cylinder arrangement type Horizontal inline. Combustion method. Direct spray. Cooling method Air cooling. Displacement(L). 0.954 Compression ratio. 19；1 Rated speed (min / r) 3000 Power (kW) 12 Dimensions (mm) 452×560×418 Working environment temperature (℃) -41～55

[0042] Working principle:

[0043] The first step is that the connecting part 6 is a component on the vehicle body, which is used to carry the engine body 1. The crankshaft output end 11 is connected to the transmission system of the engine and is responsible for outputting power. The low-pressure pump 12 is connected to the fuel supply system through a pipeline. The muffler 15 is used to discharge exhaust gas and reduce exhaust noise. The flywheel fan end 17 cooperates with the flywheel to balance and dissipate heat. The ECU system 2 is connected to various sensors and actuators of the engine through lines to achieve precise control of the working state of the engine. The oil filter 3 is installed in the oil circuit of the engine body 1 to filter impurities in the engine oil. The radiator 4 is connected to the The engine cooling system is connected to the engine to achieve heat dissipation of the engine. The diesel engine adopts light materials to ensure a good power-to-weight ratio (0.173KW / Kg), ensuring that the whole machine is small in size and light in weight, effectively meeting the needs of the market. The advanced and precise electronic speed control system can easily realize the conversion of various application modes. The superior engine control ability ensures that the engine speed fluctuation rate is controlled within 0.3%, achieving 0 speed regulation, ensuring the voltage stability of the generator set, and can achieve the same voltage value under no-load and load conditions, improving and facilitating the fault maintenance of the speed control system;

[0044] In the second step, the diesel engine solved the problem of matching the power and volume of the auxiliary power supply on the vehicle, filled the gap in the domestic 10-20Kw power range of horizontal air-cooled diesel engines, broadened the use of two-cylinder diesel engines, accelerated the development of two-cylinder diesel engine series, improved the engine's technological content and grade, and obtained greater market and economic benefits.

[0045] The third step is that in the initial state, the mounting block 8 is not blocked by the two L plates 73, so that the mounting block 8 can be retracted into the receiving groove 71 under force, so that the bracket 5 can stably contact the ground, so that the diesel engine can be stably placed on the ground. When the diesel engine needs to be installed, the hand wheel 75 is twisted to rotate the threaded rod 74, and the two L plates 73 are moved closer to each other through the rotation of the threaded rod 74, so that the two L plates 73 are inserted into the receiving groove 71, and the position of the mounting block 8 is limited and blocked. At this time, the mounting block 8 passes through the through hole 51, and the bottom end of the mounting block 8 extends out of the bracket 5 to form a positioning portion. Align the mounting block 8 with the mounting groove 61 and insert it therein to complete the positioning connection between the bracket 5 and the connecting portion 6, thereby positioning the installation of the bracket 5, making the bolt insertion more convenient and quick, reducing the adjustment and calibration time during the installation process, further improving the installation speed, making the installation of the diesel engine more convenient, and when not installed, the mounting block 8 can be retracted into the receiving groove 71, so that the bottom of the bracket 5 can be flush, ensuring that the diesel engine can be stably placed on the ground, which can not only meet the positioning requirements during installation, but also maintain stability during disassembly and placement, and adapt to a variety of usage scenarios;

[0046] Step 4: By inserting the mounting block 8 into the mounting groove 61, the horizontal blocking force between the bracket 5 and the connecting part 6 is increased, the impact resistance is enhanced, and the impact force can be better borne and dispersed when the diesel engine is impacted in the horizontal direction, and the connecting parts and internal structures are protected from damage;

[0047] The fifth step, after the bracket 5 is connected and fixed to the connecting part 6, the hand wheel 75 is continued to be twisted to make the threaded rod 74 continue to rotate, and the two L plates 73 are driven to move closer to each other through the rotation of the threaded rod 74, and the two contact blocks 1 76 are driven to move closer to each other through the movement of the two L plates 73. The two contact blocks 1 76 are driven to move closer to each other, and the two contact blocks 1 76 are driven to move closer to each other. A force is applied to the two contact blocks 3 87 by the movement of the two contact blocks 1 76, so that the fixing rod 86 is moved, and the movement of the fixing rod 86 drives the push block 85 to move. The movement of the push block 85 applies a force to the two contact blocks 2 84, so that the two contact blocks 2 84 move away from each other, and the two contact blocks 2 84 move away from each other. The two card blocks 82 are respectively inserted into the card slots 62, and the mounting block 8 is blocked in the vertical direction at this time, so that the connection and fixation between the bracket 5 and the connecting part 6 are reinforced, the firmness of the connection is improved, and the risk of component failure or falling off due to loose connection is reduced, thereby ensuring the stable operation of the diesel engine.

[0048] In the sixth step, the slide bar 81 is fixedly connected to the inner wall of the mounting block 8 by a spring 1 83, which resets the slide bar 81. The fixed bar 86 is fixedly connected to the fixed plate 9 by a spring 2 91, which resets the fixed bar 86. The limiting bar 92 movably passes through the fixed bar 86, which limits the movement of the fixed bar 86, so that it can only move in the horizontal direction. The structural design is reasonable.

[0049] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A small horizontal two-cylinder diesel engine, comprising a body (1), characterized in that: Two horizontal in-line cylinders are arranged in parallel inside the machine body (1); The engine body (1) is provided with a crankshaft output end (11) inside, the engine body (1) is provided with a low-pressure pump (12), the engine body (1) is provided with an intake pipe (13) and a first exhaust pipe (14), the engine body (1) is provided with a muffler (15), the first exhaust pipe (14) is connected to the muffler (15), and the muffler (15) is connected to a second exhaust pipe (16); Wherein, a flywheel fan end (17) is provided at one end of the machine body (1), an air filter (18) is connected to the air intake pipe (13) for filtering the incoming air, and an ECU system (2) is provided in the machine body (1); Wherein, an oil filter (3) is arranged on the oil circuit of the machine body (1), and a radiator (4) is arranged on one end of the machine body (1) near the flywheel fan end (17); Both sides of the bottom end of the body (1) are fixedly connected with brackets (5), and a connecting portion (6) is provided below each bracket (5), and the connecting portion (6) is a component on the vehicle body, which is used to support the body (1), and each bracket (5) is rotatably screwed with a bolt, wherein each bracket (5) is respectively threadedly fixed to the connecting portion (6) by a bolt; A mounting groove (61) is provided in the middle of the upper surface of each connecting portion (6), and a clamping groove (62) is provided on the inner walls on both sides of each mounting groove (61), wherein a through hole (51) communicating with the mounting groove (61) is provided on the surface of each bracket (5); Each of the brackets (5) is provided with a positioning assembly, the positioning assembly comprising a fixing frame (7), a mounting block (8) and a fixing plate (9), wherein the mounting block (8) is used to be positioned with the mounting groove (61) of the connecting portion (6) to assist in the installation of the diesel engine, the fixing frame (7) is fixedly mounted at the middle of the upper end of the bracket (5), and a receiving groove (71) communicating with the through hole (51) is provided on the surface of the fixing frame (7); L-plates (73) are movably inserted into the two ends of the fixed frame (7), and the surfaces of the two L-plates (73) are provided with threaded holes, and the thread directions of the two threaded holes are opposite, wherein a threaded rod (74) is rotatably mounted on the fixed frame (7), and the threaded rod (74) passes through the two threaded holes, and the two ends of the threaded rod (74) are fixedly connected with hand wheels (75); Both ends of the fixed frame (7) are fixedly connected to support blocks (72), and the two L-plates (73) are slidably mounted on the upper ends of the support blocks (72), wherein the two L-plates (73) are fixedly connected to contact blocks 1 (76); The mounting block (8) is slidably mounted in the receiving groove (71) and movably penetrates the through hole (51); two sliding rods (81) are slidably mounted in the mounting block (8); the ends of the two sliding rods (81) are fixedly connected with a clamping block (82); wherein the two sliding rods (81) are fixedly connected with a spring 1 (83); and the two sliding rods (81) are fixedly connected with the inner wall of the mounting block (8) via the spring 1 (83); The bottom end of the mounting block (8) is inserted into the mounting groove (61), and the two clamping blocks (82) are respectively movably inserted into the clamping grooves (62), wherein the upper end of each of the slide bars (81) is fixedly connected with a contact block 2 (84), and a push block (85) is arranged between the two contact blocks 2 (84), and the surfaces of the push block (85) and the two contact blocks 2 (84) that are in contact with each other are both inclined surfaces; The upper end of the push block (85) is fixedly connected to a fixing rod (86), and both ends of the fixing rod (86) are fixedly connected to contact blocks three (87), wherein the two contact blocks three (87) are respectively fitted with the surfaces of the two contact blocks one (76), and the fitted surfaces are designed as inclined surfaces; The fixing plate (9) is fixedly mounted on the upper end of the mounting block (8); a spring 2 (91) is fixedly connected between the fixing plate (9) and the fixing rod (86); a limiting rod (92) is fixedly connected to the fixing plate (9); the limiting rod (92) movably passes through the fixing rod (86); an annular groove is arranged in the fixing frame (7); a limiting ring (77) is fixedly mounted on the threaded rod (74); the limiting ring (77) is arranged in the annular groove.

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