CN222542554U - Fuel injection pump for diesel engines - Google Patents

Abstract

The utility model relates to the technical field of fuel injection pumps, in particular to a fuel injection pump for a diesel engine, which comprises a pump shell and a transmission shell which are integrally connected, wherein two groups of pumping cavities are formed in the shell of the pump shell, two brake shafts which are horizontally opposite and penetrate through the transmission shell are rotatably connected in the cavities of each group of pumping cavities, two groups of fuel injection nozzles are symmetrically connected and installed on one side of the shell of the transmission shell, and eccentric wheels for propping the fuel injection nozzles are arranged on the upper half part of a shaft rod of one group of the brake shafts. When the diesel engine fuel injection pump is assembled and assembled, the oil pumping pipeline and the fuel injection nozzle transmission structure are assembled in a modularized and integrated mode based on the integral connection of the pump shell and the transmission shell, so that linkage operation between the oil pumping 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, the whole occupied space is smaller, the linkage operation is more efficient, the manufacturing cost is saved, and the integral linkage stability is improved.

Description

Fuel injection pump for diesel engine

Technical Field

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

The diesel engine has the advantages of large torque and good economic performance, and is widely used for large-power high-speed diesel engines mainly matched with heavy-duty automobiles, large buses, engineering machinery, ships, generator sets and the like. When the diesel engine works, air enters the cylinder, when the air in the cylinder is compressed to the end point, the temperature can reach 500-700 ℃, the pressure can reach 40-50 atmospheres, and when the piston approaches to the top dead center, the fuel nozzle of the fuel supply system sprays fuel to the combustion chamber of the cylinder at extremely high pressure in extremely short time, the diesel forms fine fuel particles, the fine fuel particles are mixed with high-pressure and high-temperature air, the combustible mixture is automatically combusted, the explosive force is generated by violent expansion, the piston is pushed to do work downwards, and the large torque force is generated.

The oil supply system of the diesel engine generally utilizes the spray liquid of the oil injection pump to supply oil, the oil injection nozzle of the oil injection pump is synchronously matched and arranged according to the cylinder number of the diesel engine, for example, the diesel engine with a double cylinder form needs to be matched with two groups of oil injection nozzles, oil is sprayed into the cylinder to burn, explosive force is generated, and the piston of the diesel engine is pushed to operate. However, the existing diesel oil pump is often far apart between the pump body and the oil nozzle, and the integrated linkage operation of the diesel oil pump is often driven in parallel by adopting a complex transmission mechanism, so that the oil pump is large in integral structure, poor in integrated modularized assembly performance and high in assembly cost. To this end, those skilled in the art have provided injection pumps for use on diesel engines to address the problems set forth in the background above.

Disclosure of utility model

The utility model mainly aims to provide the fuel injection pump for the diesel engine, which can effectively solve the problems of complex operation of the whole linkage structure, poor integrated modularization assembly performance and high assembly cost of the fuel injection pump of the existing diesel engine in the background technology.

In order to achieve the aim, the utility model adopts the technical scheme that an oil injection pump used on a diesel engine comprises a pump shell and a transmission shell which are integrally connected;

Two groups of pumping pressure cavities are formed in the shell of the pump shell, two braking shafts which are horizontally opposite and penetrate through the transmission shell are connected in a rotating mode in the cavity of each group of pumping pressure cavities, and pumping pressure gears which are arranged in the pumping pressure cavities are arranged at the lower half parts of shaft rods of the two adjacent braking shafts;

Two groups of oil nozzles are symmetrically arranged on one side of the shell of the transmission shell in a conducting way, and eccentric wheels for supporting the oil nozzles are arranged at the upper half part of the shaft lever of one group of the brake shafts;

The chambers of the two groups of pumping pressure chambers are communicated and connected with an oil inlet pipeline penetrating through the transmission shell, and the two groups of pumping pressure chambers are converged and communicated through an oil injection pipeline.

As a still further scheme of the utility model, the oil inlet valves are arranged at the top ends of the two groups of the oil inlet pipelines in a conducting way.

As a still further scheme of the utility model, the bottom end of the pipeline of the oil injection pipeline is symmetrically provided with converging openings communicated with the two groups of pumping pressure cavities, and the top end of the pipeline of the oil injection pipeline is symmetrically communicated and provided with two groups of oil injection valves.

As a still further proposal of the utility model, the bottom of the shell of the pump shell is rotatably connected with a transmission shaft for driving a brake shaft.

As a still further scheme of the utility model, the bottom ends of the shaft rods of the transmission shafts are provided with transmission gears, and the bottom ends of the shaft rods of the two groups of brake shafts are provided with brake gears meshed with the transmission gears in an inclined and diagonal mode.

As a still further aspect of the utility model, the teeth of two of said pump gears which are horizontally opposed are intermeshed.

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

When the diesel engine fuel injection pump is assembled and assembled, the oil pumping pipeline and the fuel injection nozzle transmission structure are assembled in a modularized and integrated mode based on the integral connection of the pump shell and the transmission shell, so that linkage operation between the oil pumping 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, the whole occupied space is smaller, the linkage operation is more efficient, the manufacturing cost is saved, and the integral linkage stability is improved.

Drawings

FIG. 1 is a schematic diagram of an injection pump for use in a diesel engine according to the present utility model;

FIG. 2 is a first cross-sectional view of an injection pump for use with a diesel engine according to the present utility model;

FIG. 3 is a second cross-sectional view of an injection pump of the present utility model for use with a diesel engine;

Fig. 4 is a bottom view of an injection pump for use in a diesel engine according to the present utility model.

In the figure, 1, a pump shell, 2, a transmission shell, 3, an oil nozzle, 4, an oil inlet valve, 5, an oil injection valve, 6, an oil injection pipeline, 7, a brake shaft, 8, an eccentric wheel, 9, an oil inlet pipeline, 10, a confluence opening, 11, a pumping cavity, 12, a pumping gear, 13, a transmission shaft, 14, a transmission gear, 15 and a brake gear.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "mounted," "configured to," "connected," and the like are to be construed broadly as, for example, "connected" may be fixedly connected, may be detachably connected, or integrally connected, may be mechanically connected or electrically connected, may be directly connected or indirectly connected through an intermediate medium, and may be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1-4, an oil injection pump for a diesel engine comprises a pump shell 1 and a transmission shell 2 which are integrally connected, and an oil pump pressure pipeline and an oil injection nozzle transmission structure are assembled integrally and modularly based on the integral connection of the pump shell 1 and the transmission shell 2, so that linkage operation between the oil pump pressure pipeline and the oil injection nozzle transmission structure is simpler and more visual, a traditional parallel driving mode of a complex transmission structure is replaced, the whole occupied space is smaller, the linkage operation is more efficient, and the manufacturing cost is saved.

As shown in fig. 2 and 3, the chambers of the two sets of pumping chambers 11 are respectively connected with an oil inlet pipeline 9 penetrating through the transmission shell 2, the two sets of pumping chambers 11 are converged and communicated through an oil injection pipeline 6, the pipeline top ends of the two sets of oil inlet pipelines 9 are respectively connected with an oil inlet valve 4, the pipeline bottom ends of the oil injection pipeline 6 are symmetrically provided with converging openings 10 communicated with the two sets of pumping chambers 11, the pipeline top ends of the oil injection pipeline 6 are symmetrically connected with two sets of oil injection valves 5, oil is respectively supplied into the two sets of pumping chambers 11 through the combination of the oil inlet valves 4 and the oil inlet pipeline 9, the oil is pumped out through the converging openings 10 by utilizing the symmetrical rotation transmission of an internal pumping gear 12, is integrally converged into the oil injection pipeline 6, and is then supplied into the two sets of oil injection nozzles 3 by utilizing the pumping split flow of the two sets of oil injection valves 5, the uniformity and stability of oil injection can be ensured by ensuring the uniform flow distribution of the oil in the oil pressure pipeline.

As shown in fig. 4, two groups of oil nozzles 3 are symmetrically connected and installed on one side of a shell of the transmission shell 2, an eccentric wheel 8 supporting the oil nozzles 3 is arranged at the upper half part of a shaft rod of one group of brake shafts 7, a transmission shaft 13 driving the brake shafts 7 is rotatably connected to the bottom of the shell of the pump shell 1, a transmission gear 14 is arranged at the bottom end of the shaft rod of the transmission shaft 13, brake gears 15 meshed with the transmission gears 14 are arranged at the bottom ends of the shaft rods of the two groups of brake shafts 7 in an inclined diagonal mode, the transmission gear 14 is driven to rotate based on the transmission shaft 13 as a driving source, and the two groups of brake shafts 7 are driven to operate in a linkage mode by utilizing the meshing transmission of the transmission gear 14 and the brake gears 15 to generate braking force, so that on one hand, the pumping gear 12 is pushed to operate to push oil liquid pumping, and on the other hand, the oil nozzle 3 is pushed to open and close in a reciprocating mode, and the oil liquid is pushed out.

As shown in fig. 3, two sets of pumping cavities 11 are provided in the casing of the pump casing 1, two brake shafts 7 horizontally opposite and penetrating the transmission casing 2 are rotatably connected in the cavities of each set of pumping cavities 11, pumping gears 12 built in the cavities of the pumping cavities 11 are provided at the lower half parts of the shafts of the two adjacent brake shafts 7, teeth of the two pumping gears 12 horizontally opposite are meshed with each other, the pumping gears 12 are meshed with each other, on one hand, the pumping gears 12 can be used as a transmission part, the two sets of pumping gears 12 are meshed, the two sets of brake shafts 7 are pushed to perform symmetrical linkage operation, on the other hand, the pumping shafts 11 can be used as a negative pressure part, air in the pumping cavities 11 is extruded and discharged, negative pressure is generated, and oil is extracted under negative pressure.

When the oil injection pump of the diesel engine is installed and used, the hydraulic oil way component and the oil injection transmission component are assembled in a modularized and integrated manner based on the integrated assembly of the pump shell 1 and the transmission shell 2, so that the linkage operation between the hydraulic oil way component and the oil injection transmission component is simpler and more visual;

When the fuel injection pump works and operates, the transmission gear 14 is driven to rotate based on the transmission shaft 13 as a driving source, the two groups of brake shafts 7 are driven to operate in a linkage mode by utilizing meshed transmission of the transmission gear 14 and the brake gear 15 to generate braking force, on one hand, the pump pressure gear 12 is driven to operate in a symmetrical linkage mode by utilizing brake transmission of the two groups of brake shafts 7, air in the pump pressure cavity 11 is extruded and discharged to generate negative pressure as a negative pressure component, negative pressure is generated to extract oil liquid, the oil liquid is pumped into the two groups of pump pressure cavities 11 through the combination of the oil inlet valve 4 and the oil inlet pipeline 9 respectively, the oil liquid is pumped out through the confluence opening 10 and is integrally converged into the fuel injection pipeline 6, then the oil liquid is supplied into the two groups of fuel injection nozzles 3 by utilizing pump pressure split flow of the two groups of the fuel injection valves 5, on the other hand, the eccentric wheel 8 is driven to rotate in a circulating mode by utilizing brake transmission of the two groups of brake shafts 7 to push the fuel injection nozzles 3 to open and close the fuel injection nozzles in a reciprocating mode, the diesel engine cylinder is pushed to push the diesel engine piston to operate in a reciprocating mode.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (6)

1. The fuel injection pump used on the diesel engine is characterized by comprising a pump shell (1) and a transmission shell (2) which are integrally connected;

Two groups of pumping cavities (11) are formed in the shell of the pump shell (1), two braking shafts (7) which are horizontally opposite and penetrate through the transmission shell (2) are rotatably connected in the cavities of each group of pumping cavities (11), and pumping gears (12) which are arranged in the cavities of the pumping cavities (11) are arranged at the lower half parts of the shaft rods of the two adjacent braking shafts (7);

Two groups of oil nozzles (3) are symmetrically arranged on one side of the shell of the transmission shell (2) in a conducting way, and eccentric wheels (8) supporting the oil nozzles (3) are arranged at the upper half part of a shaft rod of one group of the brake shafts (7);

The chambers of the two groups of pumping pressure chambers (11) are communicated and connected with an oil inlet pipeline (9) penetrating the transmission shell (2), and the two groups of pumping pressure chambers (11) are converged and communicated through an oil injection pipeline (6).

2. The fuel injection pump for a diesel engine according to claim 1, characterized in that the fuel inlet valves (4) are installed at the pipe top ends of both sets of the fuel inlet pipes (9).

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 confluence opening (10) communicated with two groups of pumping chambers (11), and the top end of the fuel injection pipeline (6) is symmetrically provided with two groups of fuel injection valves (5).

4. Fuel injection pump for use on a diesel engine according to claim 1, characterized in that the housing bottom of the pump housing (1) is rotatably connected with a drive shaft (13) driving a brake shaft (7).

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

6. Fuel injection pump for use on a diesel engine according to claim 1, characterized in that the teeth of two of said pump gears (12) which are horizontally opposed are engaged with each other.