High-speed two-cylinder in-line common rail oil feed pump

Abstract

The invention discloses a high-speed two-cylinder in-line common rail oil feed pump which comprises an oil feed pump body, a cam shaft, an oil delivery pump, an oil inlet metering valve and a plunger valve component and further comprises a pressure accumulation component, the pressure accumulation component is installed on the top of the oil feed pump body, a pressure accumulation cavity and an oil spraying opening are formed in the pressure accumulation component, an oil outlet connector is installed in the oil spraying opening, and a piston is installed in the oil outlet connector. And the oil outlet joint is communicated with the common rail pipe. The pressure accumulation component is directly installed on the oil supply pump body, the structure is simplified, the volume cavity of the common rail pipe is increased, and the pressure in the common rail pipe is stabilized.

Description

Technical Field

[0001] The present invention relates to the technical field of in-line common rail fuel supply pumps, and in particular to a high-speed two-cylinder in-line common rail fuel supply pump. The high-speed two-cylinder in-line common rail fuel supply pump is applied to high-speed (greater than 1000r / min) diesel engines, medium and large power diesel engines of 500KW and above, and can meet the emission requirements of National III, National IV and above. Background Art

[0002] With the advancement of diesel engine national III, national IV or higher emission standards, high-pressure common rail fuel injection system has become the mainstream technology of diesel engine fuel system. The mainstream high-pressure common rail fuel injection system consists of common rail fuel supply pump, high-pressure fuel rail, common rail injector, ECU and sensor. In this system, the common rail fuel supply pump and high-pressure fuel rail are installed separately and separately on different parts of the diesel engine. With the stringent requirements of emission standards, a larger volume common rail pipe is required to stabilize the pressure inside it, but due to the limitation of the common rail pipe structure, it is difficult to increase the volume of its inner cavity. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the common rail fuel supply pump and the high-pressure fuel rail are separately installed at different parts of the diesel engine. Due to the limitation of the common rail pipe structure, it is difficult to increase the volume of the inner cavity. Therefore, a high-speed two-cylinder in-line common rail fuel supply pump is provided, which adds a volume cavity similar to the common rail pipe to the common rail fuel supply pump.

[0004] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0005] A high-speed two-cylinder in-line common rail fuel supply pump, comprising:

[0006] A fuel supply pump body, wherein a camshaft cavity and a first oil passage, a second oil passage and an oil return passage are provided in the fuel supply pump body 1; the oil return passage is connected to the fuel storage tank through a first oil pipe; in addition, at least one first plunger valve component installation cavity is provided in the fuel supply pump body, and the second oil passage is connected to the plunger valve component installation cavity;

[0007] A camshaft is arranged in the camshaft cavity, and the camshaft is driven to rotate by external force;

[0008] An oil delivery pump installed on the oil supply pump body and located on one end of the camshaft chamber, the oil delivery pump being driven by the camshaft to work;

[0009] An oil inlet metering valve installed on the pump body of the oil supply pump, the oil inlet of the oil inlet metering valve is connected to the oil outlet of the oil delivery pump through an oil pipe; the oil inlet of the oil inlet metering valve is connected to the first oil channel;

[0010] 1. A plunger valve component installed in the first plunger valve component installation cavity, wherein the upper end of the plunger valve component is installed with an oil inlet valve component and an oil outlet valve component that are interconnected from bottom to top; the oil inlet of the oil inlet valve component is connected to the second oil channel through the first plunger valve component installation cavity, and the oil outlet of the oil inlet valve component is connected to the oil inlet of the oil outlet valve component; it is characterized in that it also includes a pressure storage component, the pressure storage component is installed on the top of the oil supply pump body, at least one second plunger valve component installation cavity, a pressure storage cavity, at least one first oil injection channel, at least one second oil injection channel and at least one oil injection port are arranged in the pressure storage component, the second plunger valve component installation cavity cooperates with the first plunger valve component installation cavity, and the plunger valve component is installed together; the oil outlet of the oil outlet valve component is connected to the pressure storage cavity through the first oil injection channel, the pressure storage cavity is connected to the oil injection port through the second oil injection channel, an oil outlet joint is installed in the oil injection port, and the oil outlet joint is connected to the common rail pipe.

[0011] In a preferred embodiment of the present invention, a throttle plug is provided between the second oil passage and the oil return passage.

[0012] In a preferred embodiment of the present invention, a pressure relief valve component is installed on the pressure storage component, and the pressure relief valve component is located at one end of the pressure storage chamber.

[0013] In a preferred embodiment of the present invention, the upper end of the plunger valve component and the second plunger valve component mounting cavity are connected by a threaded connection and an O-ring is provided between the upper end of the plunger valve component and the second plunger valve component mounting cavity to prevent leakage of fuel and / or engine oil.

[0014] In a preferred embodiment of the present invention, the oil inlet valve component and the oil outlet valve component are both one-way valves.

[0015] In a preferred embodiment of the present invention, the oil pump adopts an internal gear type oil pump, which has a relatively small installation space, good processability and high oil supply efficiency.

[0016] In a preferred embodiment of the present invention, the volume of the pressure storage chamber is ≥8cm 3 .

[0017] In a preferred embodiment of the present invention, the camshaft is arranged in the camshaft cavity through a pair of first sliding bearings; a cam piece is installed on the camshaft through a second sliding bearing, and the cam piece drives the plunger valve component to work through the roller body of the plunger valve component.

[0018] In a preferred embodiment of the present invention, the surface of the roller body in contact with the cam sheet is a plane, and the surface is plated with diamond-like carbon (DLC).

[0019] In a preferred embodiment of the present invention, the axis of the first plunger valve component mounting chamber is perpendicular to the axis of the camshaft chamber, and the axis of the first plunger valve component mounting chamber, the axis of the first plunger valve component mounting chamber, the axis of the first oil injection passage, the axis of the second oil injection passage and the axis of the oil injection port are coaxial; the axis of the first oil injection passage and the axis of the second oil injection passage are perpendicular to the axis of the pressure accumulation chamber.

[0020] In a preferred embodiment of the present invention, the number of the first plunger valve component mounting cavities is two and parallel to each other; the number of the second plunger valve component mounting cavities is two and parallel to each other; the number of the first oil injection passages is two and parallel to each other; the number of the second oil injection passages is two and parallel to each other; the number of the oil injection ports is two and parallel to each other; and the plunger valve components are also two sets and are arranged in parallel to each other.

[0021] Due to the adoption of the above technical solution, the present invention directly installs the pressure storage component on the pump body of the fuel supply pump, thereby simplifying the structure, increasing the volume cavity of the common rail pipe, and stabilizing the pressure in the common rail pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the high-speed two-cylinder in-line common rail fuel supply pump of the present invention.

[0023] Figure 2 for Figure 1 Left view of .

[0024] Figure 3 for Figure 1 Right view of .

[0025] Figure 4 for Figure 1 Top view of the .

[0026] Figure 5 for Figure 1 A-A section view.

[0027] Figure 6 for Figure 2 G-G section view.

[0028] Figure 7 for Figure 5 Magnified view of point I.

[0029] Figure 8 for Figure 1 C-C section view. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] See also Figures 1 to 8The high-speed two-cylinder in-line common rail fuel pump shown in the figure includes: a fuel pump body 1, in which a camshaft chamber 1a and a first oil passage A, a second oil passage B and an oil return passage E that are interconnected are arranged; a throttle plug 21 is arranged between the second oil passage B and the oil return passage E, and the oil return passage E is connected to a fuel storage tank (not shown in the figure) through a pressure-stabilizing valve 29 and a first oil pipe (not shown in the figure).

[0032] In addition, two plunger valve component installation chambers 1b and 1c (the aforementioned first plunger valve component installation chambers) are provided in the oil supply pump body 1. The two plunger valve component installation chambers 1b and 1c are parallel, and the axes of the two plunger valve component installation chambers 1b and 1c are perpendicular to the axis of the camshaft chamber 1a. The second oil passage B is connected to the two plunger valve component installation chambers 1b and 1c.

[0033] The camshaft 2 is axially arranged in the camshaft cavity 1a through a pair of sliding bearings 3 (the aforementioned first sliding bearings) and a bearing seat 6, and the camshaft 2 is driven to rotate by external force; a pair of cam pieces 5 are installed on the camshaft 2 through a pair of second sliding bearings 4 (the aforementioned second sliding bearings), and each cam piece 5 drives the plunger valve component to work through a pair of roller bodies 9 of the plunger valve component. The surface of the roller body 9 in contact with the cam piece 5 is a plane, and the surface is plated with diamond-like carbon (DLC).

[0034] The oil pump 8 is installed on the oil pump body 1 and is located at one end of the camshaft cavity 1a. The oil pump 8 is driven by the camshaft 2 through the rotating sleeve 7 to work; the oil pump 8 adopts an internal gear oil pump, which has a relatively small installation space, good processability and high oil supply efficiency.

[0035] The oil inlet metering valve 20 is installed on the oil supply pump body 1, and the oil inlet of the oil inlet metering valve 20 is connected with the oil outlet of the oil delivery pump 8 through an oil pipe (not shown in the figure); the oil inlet of the oil inlet metering valve 20 is connected with the first oil channel A;

[0036] There are two sets of plunger valve components, which are respectively installed in two plunger valve component installation cavities 1b and 1c and are parallel to each other. The plunger valve components are the same as the existing plunger valve parts, including a spring seat 10, a plunger spring 11, a plunger 12 and a plunger sleeve 13. The difference is that: an oil inlet valve component 14 and an oil outlet valve component 15 that are connected to each other are installed from bottom to top at the upper end of the plunger valve component, that is, the upper end inside the plunger sleeve 13; the oil inlet of the oil inlet valve component 14 is connected to the second oil channel B through the plunger valve component installation cavities 1b, 1c and the fuel chamber (C) in the plunger hole, and the oil outlet of the oil valve component 14 is connected to the oil inlet of the oil outlet valve component 15. The oil inlet valve component 14 and the oil outlet valve component 15 are both one-way valves, which are basically the same as the existing one-way valve structure. The oil inlet valve component 14 includes a valve body 22, a spring seat 23, an oil inlet valve spring 24 and an oil outlet valve core 25. One end of the oil inlet valve spring 24 acts on the spring seat 23, and the other end acts on the oil outlet valve core 25; the oil outlet valve component 15 includes a valve body 27, an oil outlet plug 28 and an oil outlet valve spring 26. One end of the oil outlet valve spring 26 acts on the valve stem 25, and the other end acts on the oil outlet plug 28.

[0037] The present invention also includes a pressure storage component 16, which is installed on the top of the oil supply pump body 1. Two plunger valve component installation chambers 16a and 16b (the aforementioned second plunger valve component installation chamber), a pressure storage chamber D, two first oil injection passages 16c and 16d, two second oil injection passages 16e and 16f, and two oil injection ports 16g and 16h are arranged in the pressure storage component 16. The plunger valve component installation chambers 16a and 16b are parallel to each other; the two first oil injection passages 16c and 16d are parallel to each other; the two second oil injection passages 16e and 16f are parallel to each other; and the two oil injection ports 16g and 16h are parallel to each other. The axis of the plunger valve component mounting chamber 16a, the axis of the first injection channel 16c, the axis of the second injection channel 16e and the axis of the injection port 16g are coaxial; the axis of the plunger valve component mounting chamber 16b, the axis of the first injection channel 16d, the axis of the second injection channel 16f and the axis of the injection port 16h are coaxial; the axes of the plunger valve component mounting chambers 16a, 16b, the axes of the first injection channels 16c, 16d and the axes of the second injection channels 16e, 16f are perpendicular to the axis of the pressure accumulation chamber (D).

[0038] The two plunger valve component mounting chambers 16a and 16b cooperate with the two plunger valve component mounting chambers 1b and 1c respectively, and two plunger valve components are installed together; the axis of the plunger valve component mounting chamber 16a is coaxial with the axis of the plunger valve component mounting chamber 1b, and the axis of the plunger valve component mounting chamber 16b is coaxial with the axis of the plunger valve component mounting chamber 1c.

[0039] The oil outlets of the two oil outlet valve components 15 are connected to the pressure accumulation chamber D through the first oil injection passages 16c and 16d respectively, and the pressure accumulation chamber D is connected to the two oil injection ports 16g and 16h through the two second oil injection passages 16e and 16f respectively. An oil outlet connector 18 is installed in the oil injection ports 16g and 16h respectively, and the 8 oil outlet connectors are connected to the common rail pipe.

[0040] A pressure relief valve component 19 is installed on the pressure storage component 16. The pressure relief valve component 19 is located at one end of the pressure storage chamber D. A plug 17 is installed at the other end of the pressure storage chamber D. The volume of the pressure storage chamber (D) is ≥ 8 cm 3 .

[0041] The upper ends of the plunger sleeves 13 of the two sets of plunger valve components are connected to the two plunger valve component installation cavities 16a, 16b through threads, and O-rings are arranged between the upper ends of the plunger sleeves 13 of the plunger valve components and the plunger valve component installation cavities 16a, 16b to prevent fuel and / or oil leakage.

[0042] The working principle of the present invention is as follows:

[0043] The fuel flows from the storage tank through the oil pipe and the oil pump inlet to the oil pump 8. The oil output of the oil pump 8 passes through the diesel oil inlet hole, the oil inlet metering valve 20, the first oil inlet channel A, the second oil inlet channel B, the fuel chamber C, the oil inlet valve component 14, the oil outlet valve component 15, the second oil injection channel 16e, 16f to the pressure accumulation chamber D.

[0044] The fuel inlet metering valve 20 controls the amount of fuel supplied to the fuel chamber C, and the excess fuel returns to the fuel storage tank via the second oil passage B, the throttle plug 21, the oil return passage E, and the pressure regulating valve 29.

[0045] When the plunger 12 moves downward from the top dead center driven by the camshaft 2, the oil outlet valve component 15 is in a closed state under the action of the oil outlet valve spring 26, and the oil inlet valve core 25 in the oil inlet valve component 14 is in an open state under the action of the suction force formed by the downward movement of the plunger 12 and the oil inlet pressure, and the fuel enters the fuel chamber C through the conical surface of the oil inlet valve core 25, thereby completing the oil suction process.

[0046] When the plunger 12 moves upward, the fuel in the fuel chamber C is compressed. When the pressure in the fuel chamber C exceeds the oil inlet pressure and the force of the oil inlet valve spring 24, the oil inlet valve core 25 is closed flat. However, at this time, the fuel pressure is not enough to overcome the pressure of the oil outlet valve spring 26 and the fuel in the oil pipe on the steel ball, so the fuel supply pump does not supply oil.

[0047] When the plunger 12 moves upward, the fuel in the fuel chamber C continues to be compressed, and the fuel pressure in the fuel chamber C continues to rise. When the fuel pressure overcomes the pressure of the oil outlet valve spring 26 and the fuel in the oil pipe on the oil outlet valve component 15, the oil outlet valve component 15 opens, and the high-pressure fuel enters the pressure accumulation chamber D, and the fuel then enters the common rail pipe through the high-pressure oil pipe.

[0048] When the pressure in the pressure accumulator chamber D exceeds the opening pressure of the pressure limiting valve 19, the pressure limiting valve 19 opens, and the fuel returns to the fuel storage tank through the fuel pipe.

Claims

1. A high-speed two-cylinder in-line common rail fuel pump, comprising: A fuel supply pump body, wherein a camshaft cavity and a first oil passage, a second oil passage and an oil return passage are provided in the fuel supply pump body 1; the oil return passage is connected to the fuel storage tank through a first oil pipe; in addition, at least one first plunger valve component installation cavity is provided in the fuel supply pump body, and the second oil passage is connected to the plunger valve component installation cavity; A camshaft is arranged in the camshaft cavity, and the camshaft is driven to rotate by external force; An oil delivery pump installed on the oil supply pump body and located on one end of the camshaft chamber, the oil delivery pump being driven by the camshaft to work; An oil inlet metering valve installed on the pump body of the oil supply pump, the oil inlet of the oil inlet metering valve is connected to the oil outlet of the oil delivery pump through an oil pipe; the oil inlet of the oil inlet metering valve is connected to the first oil channel; The plunger valve component is installed in the first plunger valve component installation cavity, and the upper end of the plunger valve component is installed with an oil inlet valve component and an oil outlet valve component that are connected to each other from bottom to top; the oil inlet of the oil inlet valve component is connected to the second oil channel through the first plunger valve component installation cavity, and the oil outlet of the oil inlet valve component is connected to the oil inlet of the oil outlet valve component; characterized in that, It also includes a pressure storage component, which is installed on the top of the oil supply pump body, and is provided with at least one second plunger valve component installation chamber, a pressure storage chamber, at least one first oil injection passage, at least one second oil injection passage and at least one oil injection port in the pressure storage component, and the second plunger valve component installation chamber cooperates with the first plunger valve component installation chamber, and the plunger valve component is installed together; the oil outlet of the oil outlet valve component is connected with the pressure storage chamber through the first oil injection passage, and the pressure storage chamber is connected with the oil injection port through the second oil injection passage, and an oil outlet joint is installed in the oil injection port, and the oil outlet joint is connected with the common rail pipe.

2. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 1, characterized in that: A throttle plug is provided between the second oil passage and the oil return passage.

3. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 2, characterized in that: A pressure relief valve component is installed on the pressure storage component, and the pressure relief valve component is located at one end of the pressure storage chamber D.

4. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 3, characterized in that: The upper end of the plunger valve component is connected to the second plunger valve component installation cavity by a threaded connection, and an O-ring is provided between the upper end of the plunger valve component and the second plunger valve component installation cavity to prevent leakage of fuel and / or engine oil.

5. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 4, characterized in that: The oil inlet valve component and the oil outlet valve component are both one-way valves.

6. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 5, characterized in that: The oil delivery pump adopts an internal gear type oil delivery pump.

7. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 6, characterized in that: The volume of the pressure storage chamber is ≥8cm 3 .

8. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 7, characterized in that: The camshaft is arranged in the camshaft cavity through a pair of first sliding bearings; a cam piece is installed on the camshaft through a second sliding bearing, and the cam piece drives the plunger valve component to work through the roller body of the plunger valve component.

9. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 8, characterized in that: The surface of the roller body in contact with the cam sheet is a plane, and the surface is plated with diamond-like carbon.

10. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 9, characterized in that: The axis of the first plunger valve component mounting chamber is perpendicular to the axis of the camshaft chamber; the axis of the first plunger valve component mounting chamber, the axis of the first plunger valve component mounting chamber, the axis of the first injection channel, the axis of the second injection channel and the axis of the injection port are coaxial; the axis of the first injection channel and the axis of the second injection channel are perpendicular to the axis of the pressure accumulation chamber.

11. A high-speed two-cylinder in-line common rail fuel supply pump according to claim 10, characterized in that: The first plunger valve component has two mounting cavities which are parallel to each other; the second plunger valve component has two mounting cavities which are parallel to each other; the first oil injection passages are two which are parallel to each other; the second oil injection passages are two which are parallel to each other; the oil injection ports are two which are parallel to each other; and the plunger valve components also have two sets which are arranged in parallel to each other.

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