CN113217244A - Positive pressure common rail oil supply pump assembly for light diesel engine - Google Patents
Positive pressure common rail oil supply pump assembly for light diesel engine Download PDFInfo
- Publication number
- CN113217244A CN113217244A CN202110712036.2A CN202110712036A CN113217244A CN 113217244 A CN113217244 A CN 113217244A CN 202110712036 A CN202110712036 A CN 202110712036A CN 113217244 A CN113217244 A CN 113217244A
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- Prior art keywords
- oil
- pump
- fuel
- feed pump
- common rail
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/045—Arrangements for driving rotary positive-displacement pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/44—Filters structurally associated with pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
Abstract
The invention discloses a positive pressure common rail oil supply pump assembly for a light diesel engine, which comprises a pump body of an oil supply pump and an oil transfer pump, wherein the oil transfer pump is connected with the pump body, the oil transfer pump is provided with an oil inlet and an oil return hole, a pressure limiting valve is arranged on the pump body, the oil transfer pump adopts the positive pressure oil transfer pump, an oil outlet of the oil transfer pump and an oil inlet of the oil supply pump are arranged outside, an external oil passage is arranged at the oil outlet of the oil transfer pump, and a filter is connected at the oil outlet. According to the invention, the positive-pressure structure oil delivery pump is adopted, the oil outlet of the oil delivery pump and the oil inlet of the oil supply pump are arranged outside, the oil outlet of the oil delivery pump is provided with the external oil passage, and the oil outlet is connected with the filter, so that the fuel oil filtering effect is better, and the problem that the cleanliness of a common rail system is influenced because the outlet of the common negative-pressure oil delivery pump adopted in the prior art is arranged inside the aluminum pump body and cannot be externally connected with the filter is solved.
Description
Technical Field
The invention relates to the technical field of light diesel engines, in particular to a positive pressure common rail oil supply pump assembly for a light diesel engine.
Background
The oil transfer pump in the common rail oil supply pump assembly in the prior art is a negative pressure oil transfer pump with a common structure, and an outlet of the oil transfer pump is arranged in an aluminum pump body and cannot be externally connected with a precision filter, so that the cleanliness of a common rail system is influenced.
In addition, the conventional common rail fuel feed pump assembly does not adopt a check valve structure, and air is easy to enter a pump cavity from a fuel return port of the fuel feed pump when the common rail fuel feed pump assembly is placed for a long time, so that the starting of an engine is not facilitated due to the fact that the interior of the fuel pump and pipelines are filled with air; the common rail fuel feed pump assembly in the prior art does not meet the requirements of the conditions of severe working environment, poor diesel quality, long-time placement and overall arrangement diversity of non-road three-country and four-country small diesel engines with the power of 125kW or less.
Therefore, the common rail fuel feed pump assembly which meets the requirements of the small diesel engines of the third and fourth countries of non-roads with the power of 125kW and has the defects of severe working environment, poor diesel oil quality, long-time placement and diversity of overall arrangement needs to be designed and developed by technical personnel in the field.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a positive pressure common rail oil supply pump assembly for a light diesel engine. The invention adopts the oil delivery pump with the positive pressure structure, the oil outlet of the oil delivery pump with the positive pressure structure is arranged outside, namely, the oil outlet of the oil delivery pump and the oil inlet of the oil supply pump are both arranged outside, the oil outlet of the oil delivery pump is provided with the external oil duct, and a filter can be connected at the oil outlet, so that the fuel oil filtering effect is better, and the problem that the cleanliness of a common rail system is influenced because the outlet of the common negative pressure oil delivery pump adopted in the prior art is arranged inside an aluminum pump body and cannot be externally connected with the filter is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a malleation is rail fuel feed pump assembly altogether for light-duty diesel engine, includes the pump body, the fuel delivery pump of fuel feed pump, fuel delivery pump and pump body coupling, the fuel delivery pump is equipped with inlet port, oil gallery, installs the pressure-limiting valve on the pump body, the fuel delivery pump adopts malleation fuel delivery pump, and the fuel delivery pump oil-out all sets up externally with the fuel feed pump oil inlet, and external oil duct is walked to the fuel delivery pump oil-out, connects the filter in oil-out department.
The pump body adopts the aluminium pump body.
The filter adopts the accurate filter, and the accurate filter sets up on the pipeline between fuel delivery pump oil-out and fuel feed pump oil inlet.
The positive pressure oil transfer pump is a blade type oil transfer pump, and a flow limiting valve is arranged on a cover plate of the oil transfer pump.
The oil inlet end of the flow limiting valve is communicated with the high-pressure cavity of the oil transfer pump, and the oil outlet end of the flow limiting valve is communicated with the low-pressure cavity of the oil transfer pump.
The flow limiting valve is a cylindrical one-way valve.
And the oil inlet of the oil transfer pump is provided with a check valve.
The check valve adopts the plane sealing mode, and the check valve setting is in oil feed swivel nut hole.
And a flow balance valve is arranged between the fuel cavity of the fuel supply pump and the oil return hole, and the flow balance oil return port is communicated with the oil return hole.
And the pump body is provided with a pressure limiting valve.
The invention has the beneficial effects that:
1. according to the positive pressure structure oil transfer pump, the oil outlet of the positive pressure structure oil transfer pump is arranged externally, namely the oil outlet of the oil transfer pump and the oil inlet of the oil supply pump are arranged externally, the oil outlet of the oil transfer pump is provided with the external oil duct, a filter can be connected to the oil outlet, so that the fuel oil filtering effect is better, and the problem that the cleanliness of a common rail system is influenced because the outlet of a common negative pressure oil transfer pump adopted in the prior art is arranged in an aluminum pump body and cannot be externally connected with the filter is solved.
2. The filter is a precise filter which is arranged on a pipeline between an oil outlet of the oil transfer pump and an oil inlet of the oil supply pump. The cleanliness of fuel entering the fuel supply pump is effectively improved, the service life of the fuel supply pump is prolonged, and more diesel oil is stored in a pipeline due to the filter, so that the diesel engine is favorable for starting after being placed for a long time; in the prior art, the oil outlet of the oil delivery pump and the oil inlet of the oil supply pump are both arranged inside, a diesel oil filtering device cannot be added between the oil outlet of the oil delivery pump and the oil inlet of the oil supply pump, and the effect of the invention cannot be achieved.
Meanwhile, the precise filter is connected to the oil outlet, so that low-speed exhaust is smooth, the diesel oil filtering effect is better, the cleanliness of the interior of the oil supply pump is improved, and the service life of the oil supply pump is prolonged. The problem of the defeated oil pump among the common rail fuel feed pump assembly of prior art be the negative pressure fuel feed pump of ordinary structure simultaneously, its export setting inside the aluminium pump body, unable external precision filter influences the cleanliness of common rail system and fuel feed pump life weak point is solved.
3. The positive pressure oil transfer pump is a blade type oil transfer pump, and a flow limiting valve is arranged on a cover plate of the oil transfer pump. The flow under the condition of high rotating speed is limited through the flow limiting valve, and the pressure borne by the filter is reduced.
The flow limiting valve is additionally arranged between the oil inlet hole and the oil return pore passage of the oil transfer pump, so that when the rotating speed of the oil supply pump is high and the opening degree of the oil quantity metering unit is small, the outlet pressure of the oil transfer pump can be reduced and the reliability of the oil transfer pump is improved by opening the flow limiting valve.
4. In addition, after the flow limiting valve is added, the flow limiting valve is opened after the outlet pressure of the oil delivery pump reaches a certain pressure, so that the outlet pressure of the oil delivery pump is reduced, redundant diesel oil flows to the low-pressure side of the oil delivery pump through the flow limiting valve, and internal circulation of the redundant diesel oil is realized. The problem of the unlimited stream valve of the fuel delivery pump of prior art exist is solved: when the operating speed of the diesel engine fuel feed pump is high, the output power is low or the engine is empty, the fuel feed quantity of the fuel feed pump is greatly reduced, the fuel delivery quantity of the fuel delivery pump is only related to the rotating speed of the engine, but the fuel delivery quantity of the fuel delivery pump cannot be reduced at the moment, so that the pressure on the outlet side of the fuel delivery pump is increased, the abrasion of the fuel delivery pump is accelerated due to the pressure increase, and a larger fuel delivery quantity of the fuel delivery pump needs to be selected and matched with a larger diesel filter, so that the cost of the engine is increased.
5. The flow limiting valve adopts a cylindrical one-way valve, one side of the cylindrical one-way valve is communicated with the low-pressure side of the oil transfer pump, and the other side of the cylindrical one-way valve is communicated with the high-pressure cavity of the oil transfer pump. The replacement and maintenance are convenient, and the use and maintenance cost is low.
6. The check valve is additionally arranged at the oil inlet of the oil transfer pump. The starting performance of the engine is improved through the check valve, and even if the diesel engine is stopped for a long time, diesel oil in the oil supply pump is kept in the pump cavity, so that the next starting is facilitated. The problem that the common rail fuel feed pump assembly in the prior art is not favorable for starting an engine due to the fact that air easily enters a pump cavity from a fuel feed pump oil return opening when placed for a long time because an oil inlet of the common rail fuel feed pump assembly is not provided with a check valve, and the air is filled in the fuel pump and a pipeline. After the one-way valve is added to the oil inlet of the oil transfer pump, the diesel oil at the inlet of the oil transfer pump is locked, after the engine is static, the diesel oil cannot slowly return to the oil tank through the oil transfer pump, and air does not exist in an oil path, so that the engine can be started again.
7. The check valve adopts the plane sealing mode, sets up at oil feed swivel nut hole. Simple structure, convenient position, and convenient installation and disassembly.
8. The flow balance valve is communicated with the oil return port of the oil supply pump, and can solve the problems that the flow balance hole in the prior art is communicated with the oil inlet of the oil supply pump, when the pressure at the oil inlet is higher than a certain value, the rail pressure is higher and is not controlled, and an engine cannot work. The rail pressure control of the fuel system cannot be influenced by the oil inlet pressure at the front end of the oil delivery pump through the postposition of the balance flow valve. Particularly, in non-road application, the oil tank of the engine is far away from the oil supply pump, the height difference is large, the engine is not favorable for starting, and most manufacturers add the electric oil supply pump to assist the engine in starting. Because the prior art or diesel pump balance flow valve are leading, after increasing the electronic fuel delivery pump, the fuel will get into the pump chamber through balance flow valve, lead to advancing oil yield to increase, the rail pressure overshoot, cause the engine to work normally, damage the engine even.
9. And the pump body is provided with a pressure limiting valve for limiting the highest pressure of the outlet of the positive pressure oil delivery pump and keeping the constancy of the diesel oil pressure in the pump cavity of the positive pressure common rail oil supply pump. The pressure limiting valve ensures that the pressure of the pre-pressed diesel oil provided by the positive pressure fuel delivery pump is constant before the pre-pressed diesel oil enters the plunger component.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a left side cross-sectional view of FIG. 1;
FIG. 3 is a partial view from the A-direction of FIG. 2;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of a flow restriction valve configuration and connection configuration;
fig. 6 is a schematic view of the structure and connection structure of the check valve.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments.
As shown in fig. 1-6, a positive pressure common rail fuel feed pump assembly for a light diesel engine comprises a fuel delivery pump 5, a fuel amount metering unit 3, a cam shaft 6, and a pump body 1 of the fuel feed pump, wherein the fuel delivery pump 5 and the cam shaft 6 are mounted on the pump body 1, the fuel delivery pump 5 is connected and driven by the cam shaft 6 through a key, and is used for sucking and prepressing diesel fuel from a diesel tank, the pump body 1 adopts an aluminum pump body, the fuel delivery pump 5 adopts a positive pressure fuel delivery pump, a plunger component 2 is arranged in the aluminum pump body, and is used for receiving the prepressed diesel fuel, further compressing the diesel fuel and delivering the diesel fuel into a common rail pipe of a common rail system, and the fuel amount metering unit 3 is mounted on the pump body, and is used for controlling the amount of diesel fuel entering the plunger component and further controlling the pressure of the diesel fuel in the common rail pipe; the pump body is provided with a pressure limiting valve 11 for limiting the highest pressure of the outlet of the positive pressure oil delivery pump and keeping the constancy of the diesel oil pressure in the pump cavity of the positive pressure common rail oil supply pump. The pressure limiting valve 11 ensures that the pressure of the pre-pressed diesel oil provided by the positive pressure oil delivery pump is constant before entering the plunger component, and the pressure of the pre-pressed diesel oil provided by the positive pressure oil delivery pump directly influences the stability of the diesel oil pressure in the common rail pipe. A cam shaft 6 is arranged in the pump body, a cam is arranged on the cam shaft 6, the cam is matched with a roller body 4, and the roller body 4 is matched with a plunger component and used for transmitting torque and driving the plunger component and a positive pressure oil transfer pump. I.e. the plunger member 2 is driven by a cam on a camshaft, the cam comprising two or three lobes, which are equispaced about the axis of the camshaft. The tappet body part is connected with a cam and a plunger part of the cam shaft, and the plunger part comprises an oil inlet one-way valve and an oil outlet one-way valve. The positive pressure oil transfer pump, the plunger component, the metering unit, the pressure limiting valve and the camshaft of the positive pressure common rail oil supply pump assembly are integrated together through a single aluminum pump body.
As shown in fig. 2, the oil transfer pump adopts a positive pressure oil transfer pump, i.e., an oil outlet of the oil transfer pump and an oil inlet of the oil supply pump are both arranged outside, an external oil passage is arranged at an oil outlet of the oil transfer pump, and a filter is connected at the oil outlet.
The filter adopts the accurate filter, and the accurate filter sets up on the pipeline between fuel delivery pump oil-out and fuel feed pump oil inlet. The cleanliness of fuel entering the fuel supply pump is effectively improved, the service life of the fuel supply pump is prolonged, and more diesel oil is stored in a pipeline due to the filter, so that the diesel engine is favorable for starting after being placed for a long time; in the prior art, the oil outlet of the oil delivery pump and the oil inlet of the oil supply pump are both arranged inside, a diesel oil filtering device cannot be added between the oil outlet of the oil delivery pump and the oil inlet of the oil supply pump, and the effect of the invention cannot be achieved.
Meanwhile, the precise filter is connected to the oil outlet, so that low-speed exhaust is smooth, the diesel oil filtering effect is better, the cleanliness of the interior of the oil supply pump is improved, and the service life of the oil supply pump is prolonged. The problem of the defeated oil pump among the common rail fuel feed pump assembly of prior art be the negative pressure fuel feed pump of ordinary structure simultaneously, its export setting inside the aluminium pump body, unable external precision filter influences the cleanliness of common rail system and fuel feed pump life weak point is solved.
As shown in fig. 5, the positive pressure oil transfer pump is a vane type oil transfer pump, a flow limiting valve 7 is arranged on a cover plate of the oil transfer pump, an oil inlet end of the flow limiting valve is communicated with a high pressure cavity of the oil transfer pump, an oil outlet end of the flow limiting valve is communicated with a low pressure cavity of the oil transfer pump, and the high pressure cavity and the low pressure cavity are separated by a valve core of the flow limiting valve.
The flow-limiting valve adopts a cylindrical one-way valve 12.
The flow under the condition of high rotating speed is limited through the flow limiting valve, and the pressure borne by the filter is reduced. When the rotating speed of the oil supply pump is high and the opening degree of the oil quantity metering unit is small, the outlet pressure of the oil transfer pump can be reduced and the reliability of the oil transfer pump is improved by opening the flow limiting valve. After the flow limiting valve is added, the flow limiting valve is opened after the outlet pressure of the oil delivery pump reaches a certain pressure, so that the outlet pressure of the oil delivery pump is reduced, redundant diesel oil flows to the low-pressure side of the oil delivery pump through the flow limiting valve, and internal circulation of the redundant diesel oil is realized. The problem of the unlimited stream valve of the fuel delivery pump of prior art exist is solved: when the operating speed of the diesel engine fuel feed pump is high, the output power is low or the engine is empty, the fuel feed quantity of the fuel feed pump is greatly reduced, the fuel delivery quantity of the fuel delivery pump is only related to the rotating speed of the engine, but the fuel delivery quantity of the fuel delivery pump cannot be reduced at the moment, so that the pressure on the outlet side of the fuel delivery pump is increased, the abrasion of the fuel delivery pump is accelerated due to the pressure increase, and a larger fuel delivery quantity of the fuel delivery pump needs to be selected and matched with a larger diesel filter, so that the cost of the engine is increased.
As shown in fig. 4, a check valve 8 is additionally arranged at the oil inlet of the oil transfer pump. The check valve 8 can avoid the common rail fuel feed pump assembly in the prior art, and even if the diesel engine is stopped for a long time, the diesel oil in the fuel feed pump is kept in the pump cavity, thereby being beneficial to the next starting.
Under the condition that the engine is placed for a long time, diesel oil in the oil supply pump is easy to slowly return to the oil tank through the internal oil way, so that air enters the oil supply pump, the engine is difficult to start or cannot be started, and the engine can be started only by removing the air in the pipeline again through the hand pump. After the one-way valve is added to the oil inlet of the oil transfer pump, the diesel oil at the inlet of the oil transfer pump is locked, after the engine is static, the diesel oil cannot slowly return to the oil tank through the oil transfer pump, and air does not exist in an oil path, so that the engine can be started again. The problem of do not have check valve structure among the prior art and exist because the air easily gets into the pump intracavity from the fuel feed pump oil return opening when placing for a long time, lead to being unfavorable for the engine start because of being full of the air in the oil pump inside and the pipeline is solved, improve the startability of diesel engine.
The check valve adopts the plane sealing mode, sets up at oil feed swivel nut hole.
As shown in fig. 4, the fuel feed pump is provided with a balance flow valve 9, the balance flow valve 9 is arranged between a fuel cavity and an oil return hole of the fuel feed pump, namely, the balance flow valve 9 is arranged at the rear, one side of the balance flow valve is connected with the fuel cavity 13, and the other side of the balance flow valve is connected with the oil return box 14, so that the problems that the flow balance hole in the prior art is communicated with the fuel inlet of the fuel feed pump, when the pressure at the fuel inlet is higher than a certain value, the rail pressure is higher, the engine is not controlled, and the engine cannot work can be solved.
The rail pressure control of the fuel system cannot be influenced by the oil inlet pressure at the front end of the oil delivery pump through the postposition of the balance flow valve. Particularly, in non-road application, the oil tank of the engine is far away from the oil supply pump, the height difference is large, the engine is not favorable for starting, and most manufacturers add the electric oil supply pump to assist the engine in starting. Because the prior art or diesel pump balance flow valve are leading, after increasing the electronic fuel delivery pump, the fuel will get into the pump chamber through balance flow valve, lead to advancing oil yield to increase, the rail pressure overshoot, cause the engine to work normally, damage the engine even.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for the purpose of describing the present invention but do not require that the present invention must be constructed or operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be interpreted broadly, and may be connected or disconnected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.
The above description is of the preferred embodiment of the present invention, and the description of the specific embodiment is only for better understanding of the idea of the present invention. It will be appreciated by those skilled in the art that various modifications and equivalents may be made in accordance with the principles of the invention and are considered to be within the scope of the invention.
Claims (10)
1. The utility model provides a malleation is rail fuel feed pump assembly altogether for light-duty diesel engine, includes the pump body, the fuel delivery pump of fuel feed pump, fuel delivery pump and pump body coupling, the fuel delivery pump is equipped with inlet port, oil gallery, and characterized by installs the pressure-limiting valve on the pump body, the fuel delivery pump adopts malleation fuel delivery pump, and the fuel delivery pump oil-out all sets up externally with the fuel feed pump oil inlet, and external oil duct is walked to the fuel delivery pump oil-out, connects the filter in oil-out department.
2. The positive pressure common rail fuel feed pump assembly for a light-duty diesel engine as set forth in claim 1, wherein said pump body is an aluminum pump body.
3. The positive pressure common rail feed pump assembly for a light-duty diesel engine as claimed in claim 1, wherein said filter is a precision filter provided on a pipe between an oil outlet of the feed pump and an oil inlet of the feed pump.
4. The positive pressure common rail fuel feed pump assembly for a light diesel engine as claimed in claim 1, wherein said positive pressure fuel feed pump is a vane type fuel feed pump, and a flow restriction valve is provided on a cover plate of the fuel feed pump.
5. The positive pressure common rail feed pump assembly for a light diesel engine of claim 4, wherein an oil inlet end of said flow restriction valve is communicated with a high pressure chamber of the feed pump, and an oil outlet end of the flow restriction valve is communicated with a low pressure chamber of the feed pump.
6. The positive pressure common rail supply pump assembly for a light diesel engine of claim 4, wherein said flow restriction valve is a cylindrical check valve.
7. The positive pressure common rail fuel feed pump assembly for a light diesel engine as claimed in claim 1, wherein a check valve is provided at the fuel inlet of the fuel feed pump.
8. The positive pressure common rail fuel feed pump assembly for the light diesel engine as claimed in claim 7, wherein the check valve is formed in a plane sealing manner, and is disposed in an inner hole of the fuel inlet thread insert.
9. The positive pressure common rail fuel feed pump assembly for a light diesel engine as claimed in claim 1, wherein a flow balance valve is provided between the fuel chamber of the fuel feed pump and the oil return hole, and the flow balance valve is communicated with the oil return port of the fuel feed pump.
10. The positive pressure common rail fuel feed pump assembly for the light diesel engine as claimed in claim 1, wherein a pressure limiting valve is installed on the pump body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712036.2A CN113217244A (en) | 2021-06-25 | 2021-06-25 | Positive pressure common rail oil supply pump assembly for light diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712036.2A CN113217244A (en) | 2021-06-25 | 2021-06-25 | Positive pressure common rail oil supply pump assembly for light diesel engine |
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|---|---|
| CN113217244A true CN113217244A (en) | 2021-08-06 |
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| CN202110712036.2A Pending CN113217244A (en) | 2021-06-25 | 2021-06-25 | Positive pressure common rail oil supply pump assembly for light diesel engine |
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Application publication date: 20210806 |
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