Fuel injection pump used on diesel engine

Abstract

The utility model relates to the technical field of fuel injection pumps, in particular to a fuel injection pump used on a diesel engine, which comprises a pump shell and a transmission shell which are integrally connected, two groups of pump pressure cavities are arranged inside a shell body of the pump shell, and two brake shafts which are horizontally opposite and penetrate through the transmission shell are rotatably connected inside cavities of each group of pump pressure cavities. Two sets of oil nozzles are symmetrically installed on one side of a shell body of the transmission shell in a communicating mode, and eccentric wheels for supporting the oil nozzles are arranged on the upper half portions of shaft rods of one set of brake shafts. When the fuel injection pump of the diesel engine is assembled, on the basis of integral connection of the pump shell and the transmission shell, the oil pumping pressure pipeline and the fuel injection nozzle transmission structure are modularly and integrally assembled, so that linkage operation between the oil pumping pressure pipeline and the fuel injection nozzle transmission structure is simpler and more visual, a parallel driving mode of a traditional complex transmission structure is replaced, and the fuel injection pump of the diesel engine is smaller in overall occupied space and more compact in structure. The linkage operation is more efficient, the manufacturing cost is saved, and meanwhile the integral linkage stability can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injection pumps, in particular to a fuel injection pump used on a diesel engine. Background Art

[0002] Diesel engines are widely used in high-power high-speed diesel engines, mainly supporting heavy-duty vehicles, large buses, engineering machinery, ships, generator sets, etc., due to their advantages of large torque and good economic performance. When a diesel engine is working, air enters the cylinder. When the air in the cylinder is compressed to the end, the temperature can reach 500-700℃ and the pressure can reach 40-50 atmospheres. When the piston approaches the top dead center, the fuel injection nozzle of the fuel supply system sprays fuel into the cylinder combustion chamber at extremely high pressure in a very short time. The diesel forms fine oil particles and mixes with high-pressure and high-temperature air. The combustible mixture burns by itself, expands violently to produce explosive force, pushes the piston downward to do work, and generates large torque.

[0003] The fuel supply system of a diesel engine usually uses a fuel injection pump to spray liquid for fuel supply. The fuel injection nozzle of the fuel injection pump is synchronously matched and set according to the number of cylinders of the diesel engine. For example, a two-cylinder diesel engine needs to match two sets of fuel injection nozzles to spray the oil into the cylinder for combustion, generate explosive force, and drive the diesel engine piston to operate. However, the existing diesel engine oil pumps are often far apart from the pump body and the fuel injection nozzles, and their integrated linkage operation often uses a complex transmission mechanism for parallel drive, resulting in a larger overall structure of the fuel injection pump, poor integrated modular assembly performance, and high assembly cost. To this end, those skilled in the art provide a fuel injection pump for use in a diesel engine to solve the problems raised in the above background technology. Utility Model Content

[0004] The main purpose of the utility model is to provide a fuel injection pump for a diesel engine, which can effectively solve the problems of the existing diesel engine fuel injection pump in the background technology, such as complex operation of the overall linkage structure, poor integrated modular assembly performance and high assembly cost.

[0005] To achieve the above object, the technical solution adopted by the utility model is as follows: a fuel injection pump used in a diesel engine comprises a pump housing and a transmission housing connected in one piece;

[0006] Two groups of pump pressure chambers are provided inside the pump housing, and two brake shafts which are horizontally opposite and pass through the transmission housing are rotatably connected inside the chamber of each group of pump pressure chambers, and the lower halves of the shafts of the two adjacent brake shafts are provided with pump pressure gears which are built into the chambers of the pump pressure chambers;

[0007] Two groups of oil spray nozzles are symmetrically installed on one side of the transmission housing, and an eccentric wheel supporting the oil spray nozzle is provided on the upper half of the shaft rod of one group of brake shafts;

[0008] The chambers of the two groups of pump pressure chambers are both connected to the oil inlet pipeline that passes through the transmission housing, and the two groups of pump pressure chambers are connected through the oil injection pipeline.

[0009] As a further solution of the utility model: the top ends of the pipes of the two groups of oil inlet pipelines are both equipped with oil inlet valves.

[0010] As a further solution of the utility model: the bottom end of the fuel injection pipeline is symmetrically provided with a converging opening connected to the two groups of pump pressure chambers, and the top end of the fuel injection pipeline is symmetrically connected with two groups of fuel injection valves.

[0011] As a further solution of the utility model: the bottom of the pump housing is rotatably connected with a transmission shaft that drives the brake shaft.

[0012] As a further solution of the utility model: a transmission gear is arranged at the bottom end of the shaft rod of the transmission shaft, and brake gears meshing with the transmission gear are arranged diagonally at the bottom ends of the shaft rods of the two groups of brake shafts.

[0013] As a further solution of the utility model: the teeth of the two horizontally opposite pump pressure gears are meshed with each other.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The diesel engine fuel injection pump of the utility model is assembled by integrally connecting the pump casing and the transmission casing, and modularly integrating the oil pump pressure pipeline and the fuel injector transmission structure, so that the linkage operation between them is simpler and more intuitive, replacing the traditional parallel drive mode of complex transmission structure. The overall space occupied is smaller, the linkage operation is more efficient, and the manufacturing cost is saved while improving the stability of the integrated linkage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the fuel injection pump used in a diesel engine according to the utility model;

[0017] Figure 2 This is a first cross-sectional view of a fuel injection pump used in a diesel engine according to the utility model;

[0018] Figure 3 It is a second cross-sectional view of the fuel injection pump used in a diesel engine according to the utility model;

[0019] Figure 4 The utility model is a bottom view of a fuel injection pump used in a diesel engine.

[0020] In the figure: 1. Pump housing; 2. Transmission housing; 3. Fuel injector; 4. Fuel inlet valve; 5. Fuel injection valve; 6. Fuel injection pipeline; 7. Brake shaft; 8. Eccentric wheel; 9. Fuel inlet pipeline; 10. Converging opening; 11. Pump pressure chamber; 12. Pump pressure gear; 13. Transmission shaft; 14. Transmission gear; 15. Brake gear. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Please refer to Figure 1-4 As shown, the fuel injection pump used in the diesel engine includes a pump housing 1 and a transmission housing 2 which are integrally connected. Based on the integral connection between the pump housing 1 and the transmission housing 2, the oil pump pressure pipeline and the fuel injector transmission structure are modularly assembled into one, so that the linkage operation between them is simpler and more intuitive, replacing the traditional complex transmission structure parallel drive mode. The overall space occupied is smaller, the linkage operation is more efficient, and the manufacturing cost is saved.

[0025] like Figure 2 and 3As shown, the chambers of the two groups of pump pressure chambers 11 are both connected to the oil inlet pipelines 9 that pass through the transmission housing 2, and the two groups of pump pressure chambers 11 are connected through the injection pipeline 6, and the top ends of the pipelines of the two groups of oil inlet pipelines 9 are connected to each other with oil inlet valves 4, and the bottom ends of the pipelines of the injection pipelines 6 are symmetrically provided with converging openings 10 that are connected to the two groups of pump pressure chambers 11, and the top ends of the pipelines of the injection pipelines 6 are symmetrically connected to the two groups of injection valves 5, and the oil passes through the oil inlet valves 4 and the inlet valves 5. The combination of oil pipelines 9 is respectively supplied to two groups of pump pressure chambers 11. The symmetrical rotation transmission of the internal pump pressure gears 12 is used to pump and push the oil out through the confluence opening 10, and converge into the injection pipeline 6 as a whole. Then, the pump pressure of the two groups of injection valves 5 is used for diversion and supplied to the two groups of injection nozzles 3. The form of confluence and then pump pressure diversion can ensure the consistency of the oil pressure pipeline circulation, divert and discharge the oil in an isobaric form, and ensure the uniformity and stability of the oil injection.

[0026] like Figure 4 As shown, one side of the transmission housing 2 is symmetrically connected and equipped with two groups of fuel injectors 3, the upper half of the shaft rod of one group of brake shafts 7 is provided with an eccentric wheel 8 supporting the fuel injector 3, the bottom of the housing of the pump housing 1 is rotatably connected with a transmission shaft 13 driving the brake shaft 7, the bottom end of the shaft rod of the transmission shaft 13 is provided with a transmission gear 14, and the bottom ends of the shaft rods of the two groups of brake shafts 7 are diagonally provided with brake gears 15 meshing with the transmission gear 14. Based on the transmission shaft 13 as a driving source, the transmission gear 14 is driven to rotate, and the meshing transmission of the transmission gear 14 and the brake gear 15 is utilized to drive the two groups of brake shafts 7 to operate in linkage to generate braking force, which on the one hand drives the pump pressure gear 12 to operate and push the oil pump pressure, and on the other hand drives the eccentric wheel 8 to operate, which drives the fuel injector 3 to open and close reciprocally and squeeze the oil out.

[0027] like Figure 3 As shown, two groups of pump pressure chambers 11 are opened inside the shell of the pump housing 1, and the interior of each group of pump pressure chambers 11 is rotatably connected with two brake shafts 7 which are horizontally opposite and pass through the transmission housing 2, and the lower half of the shaft rods of the two adjacent brake shafts 7 are provided with pump pressure gears 12 which are built into the interior of the pump pressure chamber 11. The teeth of the two horizontally opposite pump pressure gears 12 are meshed with each other. The mutual meshing of the pump pressure gears 12 can be used as a transmission component on the one hand, and the meshing of the two groups of pump pressure gears 12 can be used to promote the symmetrical linkage operation of the two groups of brake shafts 7. On the other hand, it can be used as a negative pressure component to squeeze and discharge the air in the pump pressure chamber 11 to generate negative pressure and extract the oil under negative pressure.

[0028] The working principle of the utility model is as follows: when the diesel engine fuel injection pump is installed and used, based on the integrated assembly of the pump housing 1 and the transmission housing 2, its hydraulic oil circuit components and the fuel injection transmission components are modularly integrated, so that the linkage operation between them is simpler and more intuitive;

[0029] Later, when the fuel injection pump is working, the transmission shaft 13 is used as a driving source to drive the transmission gear 14 to rotate, and the meshing transmission of the transmission gear 14 and the brake gear 15 is used to drive the two sets of brake shafts 7 to operate in linkage to generate braking force. On the one hand, the brake transmission of the two sets of brake shafts 7 is used to drive the pump pressure gear 12 to operate symmetrically in linkage, and as a negative pressure component, the air in the pump pressure chamber 11 is squeezed out to generate negative pressure, and the oil is negatively pressured to be extracted, and the oil is passed through the combination of the oil inlet valve 4 and the oil inlet pipeline 9. The oil is pumped into two groups of pump pressure chambers 11 under negative pressure, and the oil is pumped out through the confluence opening 10, and converged into the injection pipeline 6. Then, the pump pressure of the two groups of injection valves 5 is used to divert the oil and supply it to the two groups of injection nozzles 3. On the other hand, the braking transmission of the two groups of brake shafts 7 is used to drive the eccentric wheel 8 to rotate in a circle, and the injection nozzles 3 are pushed to open and close reciprocatingly, so as to squeeze and push out the oil, push it to burn in the diesel engine cylinder to generate braking thrust, push the diesel engine piston to reciprocate, and then drive the diesel engine to operate.

[0030] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A fuel injection pump for a diesel engine, characterized in that: It comprises a pump casing (1) and a transmission casing (2) which are integrally connected; The pump housing (1) has two groups of pump pressure chambers (11) formed inside the housing, and the interior of each group of pump pressure chambers (11) is rotatably connected to two brake shafts (7) that are horizontally opposite and penetrate the transmission housing (2), and the lower halves of the shafts of the two adjacent brake shafts (7) are provided with pump pressure gears (12) built into the interior of the pump pressure chambers (11); Two groups of oil spray nozzles (3) are symmetrically mounted on one side of the transmission housing (2), and an eccentric wheel (8) supporting the oil spray nozzles (3) is disposed on the upper half of the shaft of one group of the brake shafts (7); The chambers of the two groups of pump pressure chambers (11) are both connected to an oil inlet pipeline (9) that passes through the transmission housing (2), and the two groups of pump pressure chambers (11) are connected to each other through an oil injection pipeline (6).

2. The fuel injection pump for a diesel engine according to claim 1, characterized in that: The top ends of the pipelines of the two groups of oil inlet pipelines (9) are both equipped with oil inlet valves (4).

3. The fuel injection pump for a diesel engine according to claim 1, characterized in that: The bottom end of the fuel injection pipeline (6) is symmetrically provided with a converging opening (10) that is in communication with two groups of pump pressure chambers (11), and the top end of the fuel injection pipeline (6) is symmetrically provided with two groups of fuel injection valves (5).

4. The fuel injection pump for a diesel engine according to claim 1, characterized in that: The bottom of the pump housing (1) is rotatably connected to a transmission shaft (13) that drives the brake shaft (7).

5. The fuel injection pump for a diesel engine according to claim 4, characterized in that: A transmission gear (14) is provided at the bottom end of the shaft of the transmission shaft (13), and brake gears (15) meshing with the transmission gear (14) are provided at diagonally opposite ends of the shafts of the two sets of brake shafts (7).

6. The fuel injection pump for a diesel engine according to claim 1, characterized in that: The teeth of the two horizontally opposed pumping gears (12) are meshed with each other.

Images