Fuel pump with integrated oil circuit

Abstract

The present invention discloses a fuel pump with an integrated oil circuit, comprising an oil sump, a filter, a pump core, an ejector assembly, and a pressure regulator. The filter, pump core, and pressure regulator are all disposed within the oil sump via a fuel pump bracket. The fuel pump bracket is provided with a first oil passage, a second oil passage, a third oil passage, and a fourth oil passage. The first oil passage is used to connect the pump core oil outlet with the filter oil inlet, the second oil passage is used to connect the filter oil outlet with the pressure regulator oil inlet, the third oil passage is used to connect the pump core oil outlet with the ejector oil inlet, and the fourth oil passage is used to connect the pressure regulator oil outlet with the ejector oil inlet. The fuel pump bracket is provided with a fuel pump oil outlet connected to the second oil passage. The fuel pump with an integrated oil circuit is provided with an oil passage, which connects the various component brackets, thereby simplifying the structure.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel pump components, and in particular relates to a fuel pump with integrated oil circuit. Background Art

[0002] In the prior art, the connection between the filter and the pump core in the fuel pump, and between the pump core and the ejector assembly are all connected through oil pipes. The use of oil pipes not only makes the entire structure more complicated, but also the oil pipes are damaged after a period of use and need to be replaced, which increases costs. Summary of the Invention

[0003] The present invention proposes to provide a fuel pump with an integrated oil circuit. An oil channel is provided on a fuel pump bracket, and the oil channel is used to connect various components, thereby simplifying the structure.

[0004] To this end, the technical solution adopted by the present invention is: a fuel pump with an integrated oil circuit, including an oil pool, a filter, a pump core, an ejection assembly and a pressure regulator, the filter is provided with a filter inlet for fuel to flow in and be filtered, and a filter outlet nozzle for the filtered fuel to flow out, the pump core is provided with a pump core outlet nozzle for pressurized fuel to flow out, the ejection assembly is provided with an ejection oil inlet end for ejecting oil, the filter, pump core and pressure regulator are all arranged in the oil pool through a fuel pump bracket, the fuel pump bracket is provided with a first oil channel, a second oil channel, a third oil channel and a fourth oil channel, The first oil passage is used to connect the pump core oil outlet and the filter oil inlet, the second oil passage is used to connect the filter oil outlet and the pressure regulator oil inlet, the third oil passage is used to connect the pump core oil outlet and the injection oil inlet end, and the fourth oil passage is used to connect the pressure regulator oil outlet and the injection oil inlet end. A fuel pump oil outlet connected to the second oil passage is provided in the fuel pump bracket, and the outer ring of the fuel pump bracket is provided with at least three bracket mounting hooks for installing the fuel pump bracket in the oil pool. A filter cover, a pressure regulator cover, an injection extension pipe and at least two pump core mounting hooks are extended downward from the fuel pump bracket.

[0005] As a preferred option among the above scheme, the first oil channel, the second oil channel, the fourth oil channel and the third oil channel are surrounded by a quadrilateral, the filter cover, the pressure regulator cover and the ejection extension pipe are all arranged at the three corners of the quadrilateral, and the remaining corner of the quadrilateral is downwardly extended with a pump core oil outlet pipe for communicating with the pump core oil outlet nozzle, a one-way valve is provided in the upper end of the pump core oil outlet pipe, the pump core mounting hook is arranged around the pump core oil outlet pipe, the filter cover is connected with the first oil channel, one end of the second oil channel is downwardly extended with a filter oil outlet pipe located in the filter cover and for the filter oil outlet nozzle to extend, the other end of the second oil channel is connected with the pressure regulator cover, the fuel pump oil outlet nozzle is arranged in the middle of the second oil channel, and one end of the fourth oil channel is downwardly extended with a pressure regulator oil outlet pipe located in the pressure regulator cover and for the pressure regulator to discharge oil.

[0006] Further preferably, the filter includes a filter upper cover and a filter bottom shell, a filter element is arranged in the filter bottom shell, the middle part of the filter upper cover is extended upward to provide an oil inlet and outlet installation protrusion, the middle part of the oil inlet and outlet installation protrusion is provided with a ring-shaped support protrusion for supporting the filter with a stop pin, the part of the oil inlet and outlet installation protrusion located below the support protrusion is a clamping part for the stop pin to clamp, the filter oil outlet nozzle is arranged in the middle part of the oil inlet and outlet installation protrusion and is connected with the middle part of the filter element, a plurality of filter oil inlets are arranged on the oil inlet and outlet installation protrusion and are arranged around the filter oil outlet nozzle, and the filter oil inlet is connected to the outer ring of the filter element.

[0007] Further preferably, the upper end of the oil outlet nozzle of the filter is higher than the upper end of the oil inlet of the filter.

[0008] Further preferably, the filter element includes filter paper, a filter element upper cover arranged above the filter paper and a filter element lower cover arranged below the filter paper, the filter element upper cover is provided with a filter element oil outlet hole at the position corresponding to the filter oil outlet nozzle, the lower end of the filter oil outlet nozzle extends into the upper end of the filter element oil outlet hole, and an upper sealing ring is provided between the upper end of the filter element oil outlet hole and the lower end of the filter oil outlet nozzle.

[0009] Further preferably, a gap for fuel to pass through is left between the filter element upper cover and the filter paper and the filter bottom shell, and a lower sealing ring is provided between the filter element lower cover and the filter bottom shell.

[0010] Further preferably, the fuel pump bracket includes a bracket body and an oil passage cover arranged above the bracket body, and the fuel pump nozzle is arranged on the oil passage cover.

[0011] Further preferably, the outer ring of the fuel pump bracket is provided with an upward right-angled edge for easy installation.

[0012] Further preferably, three evenly distributed rubber pads are provided below the oil pool.

[0013] The beneficial effects of the present invention are as follows: the fuel pump bracket can not only realize the installation of the filter, the pressure regulator and the pump core, but also the filter and the pressure regulator can be installed on the fuel pump bracket through the retaining pin, thereby facilitating the replacement and maintenance of the filter and the pressure regulator. At the same time, since other components are installed under the pump core, in order to better support the pump core, the pump core is installed on the fuel pump bracket through the pump core mounting hook; a plurality of oil channels are integrated on the fuel pump bracket, and the oil channels can connect the pump core and the filter, the filter and the pressure regulator, the pressure regulator and the ejector assembly, and the ejector assembly and the pump core, thereby reducing the layout of the oil pipes and further reducing the complexity of the entire structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1Schematic diagram of the present invention.

[0015] Figure 2 for Figure 1 Bottom view of .

[0016] Figure 3 This is a schematic diagram of the present invention after the oil pool is eliminated.

[0017] Figure 4 It is an exploded view of the present invention.

[0018] Figure 5 Schematic diagram of the fuel pump bracket of the present invention.

[0019] Figure 6 Schematic diagram of the bracket body in the present invention.

[0020] Figure 7 for Figure 6 Bottom view of .

[0021] Figure 8 Schematic diagram of the oil gallery cover of the present invention.

[0022] Figure 9 Schematic diagram of the filter in the present invention.

[0023] Figure 10 for Figure 9 sectional view of . DETAILED DESCRIPTION

[0024] The present invention will be further described below by way of examples and in conjunction with the accompanying drawings:

[0025] like Figures 1-10 As shown, a fuel pump with an integrated oil circuit is mainly composed of an oil pool A, a filter B, a pump core C, an ejection assembly D and a pressure regulator F. A filter inlet 1 for fuel to flow in and be filtered and a filter outlet 2 for the filtered fuel to flow out are provided on the filter B. A pump core outlet 3 for pressurized fuel to flow out is provided on the pump core C. An ejection oil inlet end 4 for ejection oil to enter is provided on the ejection assembly D. The above are all existing technologies and will not be repeated here.

[0026] Filter B, pump element C, and pressure regulator F are all mounted within the fuel sump A via a fuel pump bracket E. To facilitate installation of these components, a filter cover 11, a pressure regulator cover 12, an ejector extension tube 13, and at least two pump element mounting hooks 14 are provided downwardly extending from the fuel pump bracket E. Both the filter cover 11 and the pressure regulator cover 12 are provided with receptacles for the two legs of corresponding retaining pins. This allows the filter cover to be mounted on the filter and, using the retaining pins, the filter to be installed. The pressure regulator cover can also be mounted on the pressure regulator and, also using the retaining pins, the pressure regulator to be installed. The ejector extension tube fits over the ejector end of the ejector assembly, and the barbs on the outer ring of the pump element are hooked onto the corresponding pump element mounting hooks, thereby enabling pump element installation.

[0027] To facilitate installation of the fuel pump bracket, at least three bracket mounting hooks 10 are provided on the outer ring of the fuel pump bracket E for mounting the bracket within the oil sump. To ensure that the fuel pump bracket, after being equipped with the filter B, pump element C, and pressure regulator F, is supported on the oil sump and to distribute the forces acting on the bracket, a right-angled edge 24 is provided on the outer ring of the fuel pump bracket E to facilitate installation and point upward. After installation, the vertical edge of the right-angled edge rests against the inner ring of the oil sump, while the horizontal edge rests on the top surface of the oil sump.

[0028] In order to realize the output of the fuel after filtration in the oil pool, a first oil channel 5, a second oil channel 6, a third oil channel 7 and a fourth oil channel 8 are provided in the fuel pump bracket E. The first oil channel 5 is used to connect the pump core oil nozzle 3 and the filter oil inlet 1, the second oil channel 6 is used to connect the filter oil nozzle 2 and the pressure regulator oil inlet, the third oil channel 7 is used to connect the pump core oil nozzle 3 and the injection oil inlet end 4, and the fourth oil channel 8 is used to connect the pressure regulator oil outlet and the injection oil inlet end 4. At the same time, a fuel pump oil nozzle 9 connected to the second oil channel 6 is provided in the fuel pump bracket E.

[0029] In order to reduce the length of the oil channel and the structure of the fuel pump bracket, the first oil channel 5, the second oil channel 6, the fourth oil channel 8 and the third oil channel 7 are sequentially surrounded by a quadrilateral, and the filter cover 11, the pressure regulator cover 12 and the ejector extension pipe 13 are all arranged at the three corners of the quadrilateral. A pump core oil outlet pipe 15 for communicating with the pump core oil outlet nozzle 3 is extended downward from the remaining corner of the quadrilateral, and the pump core mounting hook 14 is arranged around the pump core oil outlet pipe 15. At the same time, a one-way valve 16 is provided in the upper end of the pump core oil outlet pipe 15 to prevent the fuel pumped out by the pump core from flowing back.

[0030] To ensure that the fuel pumped by the pump element can smoothly enter the filter, the filter cover 11 is connected to the first oil passage 5. To ensure that the fuel filtered by the filter can be smoothly discharged from the fuel pump nozzle and to maintain the pressure of the fuel discharged from the fuel pump nozzle, a filter outlet pipe 17 is provided downwardly from one end of the second oil passage 6, located within the filter cover 11 and through which the filter nozzle 2 extends. The other end of the second oil passage 6 is connected to the pressure regulator cover 12, and the fuel pump nozzle 9 is located in the middle of the second oil passage 6. To ensure that the high-pressure fuel regulated by the pressure regulator can smoothly return to the oil sump, a pressure regulator outlet pipe 18 is provided downwardly from one end of the fourth oil passage 8, located within the pressure regulator cover 12 and for the pressure regulator to discharge the fuel.

[0031] The specific structure of filter B includes a filter cover 19 and a filter base 20. A filter element 21 is housed within the base 20, and the filter cover is heat-welded to the top of the base. To facilitate installation of filter B, an oil inlet and outlet protrusion 19a extends upward from the center of the filter cover 19. Also located in the center of this protrusion is an annular support protrusion 19b, which serves as a retaining pin to support the filter. The portion of the oil inlet and outlet protrusion 19a below the support protrusion 19b serves as a clamping portion for the retaining pin.

[0032] In order to ensure that the filter can flow into the first oil channel and out of the second oil channel formed in a quadrilateral after installation, the filter oil outlet nozzle 2 is set in the middle of the oil inlet and outlet mounting protrusion 19a and connected with the middle of the filter element 21, and multiple filter oil inlet ports 1 are set on the oil inlet and outlet mounting protrusion 19a and arranged around the filter oil outlet nozzle 2. At the same time, the filter oil inlet port 1 is connected with the outer ring of the filter element 21, so that the fuel to be filtered enters the surrounding area of the filter element from the filter oil inlet port. After being filtered by the filter element, the clean fuel is concentrated in the middle of the filter element and then led out along the filter oil outlet nozzle.

[0033] In order to prevent mixing of the oil during oil inlet and outlet, the upper end of the filter oil outlet nozzle 2 is arranged to be higher than the upper end of the filter oil inlet 1.

[0034] To filter the fuel entering the filter, filter element 21 comprises filter paper 21a, an upper filter cover 21b positioned above filter paper 21a, and a lower filter cover 21c positioned below filter paper 21a. Heat-melt welding is employed between filter paper 21a and upper filter cover 21b, and between filter paper 21a and lower filter cover 21c. To facilitate the removal of filtered fuel, an oil outlet hole 21d is provided on upper filter cover 21b at the location corresponding to filter nozzle 2. The lower end of nozzle 2 extends into the upper end of oil outlet hole 21d. To prevent incoming fuel from entering the filter element through oil outlet hole 4a, an upper sealing ring is provided between the upper end of oil outlet hole 21d and the lower end of nozzle 2.

[0035] To ensure that unfiltered fuel can properly enter the filter element for filtration, a gap for fuel passage is left between the filter element upper cover 21b and filter paper 21a, as well as the filter bottom housing 20. A gap is also left between the top surface of the fuel filter element upper cover and the inner bottom surface of the filter upper cover. To prevent unfiltered fuel from flowing below the filter element without being filtered, a lower sealing ring is installed between the filter element lower cover 21c and the filter bottom housing 20. The arrangement of the upper and lower sealing rings also effectively secures the filter element within the filter.

[0036] To prevent the fuel in the oil pool from flowing out in a tilted state after the fuel pump with integrated oil circuit is installed, a right-angled edge 17 that is convenient for installation and points upward is provided on the outer ring of the fuel pump with integrated oil circuit. After installation, the vertical edge of the right-angled edge 17 just rests against the inner ring of the oil pool, and the horizontal edge of the right-angled edge 17 is located above the oil pool.

[0037] To facilitate the formation of the various oil passages, the fuel pump bracket E comprises a bracket body 22 and an oil passage cover 23 positioned above the bracket body 22. The first, second, third, and fourth oil passages are all located on the bracket body and sealed by protrusions on the oil passage cover. To facilitate the installation of the fuel pump nozzle, the fuel pump nozzle 9 is fixed to the oil passage cover 23. The bracket body and oil passage cover are manufactured separately and snap-fit or directly welded together during assembly. The first oil passage 5, second oil passage 6, third oil passage 7, fourth oil passage 8, bracket mounting hook 10, filter cover 11, pressure regulator cover 12, ejector extension tube 13, pump core mounting hook 14, pump core oil outlet pipe 15, filter oil outlet pipe 17, and pressure regulator oil outlet pipe 18 are all integrally formed on the bracket body.

[0038] In order to disperse the forces applied to the entire fuel pump bracket after the installation of the filter, pressure regulator and pump core, a right-angled edge 24 is provided on the outer ring of the fuel pump bracket for easy installation and pointing upward. After installation, the vertical edge of the right-angled edge 24 just rests against the inner ring of the oil pool, and the horizontal edge of the right-angled edge 24 is located above the oil pool.

[0039] To prevent the bottom of the oil pool from directly contacting the bottom of the fuel tank, thereby preventing fuel from entering the oil pool, three evenly distributed rubber pads 25 are provided below the oil pool A, and the bottom surface of the rubber pads is lower than the bottom surface of the oil pool.

[0040] When installing the filter, regulator, ejector assembly and pump core of this embodiment, sealing rings are provided inside the filter cover, pressure regulator cover, ejector extension pipe and pump core oil outlet pipe to prevent fuel from leaking out.

Claims

1. A fuel pump with an integrated oil circuit, comprising an oil pool (A), a filter (B), a pump core (C), an ejection assembly (D) and a pressure regulator (F), wherein the filter (B) is provided with a filter inlet (1) for fuel to flow in and be filtered, and a filter outlet (2) for the filtered fuel to flow out, the pump core (C) is provided with a pump core outlet (3) for pressurized fuel to flow out, and the ejection assembly (D) is provided with an ejection oil inlet end (4) for ejection oil to enter, characterized in that: The filter (B), pump core (C) and pressure regulator (F) are all arranged in the oil pool (A) through the fuel pump bracket (E). The fuel pump bracket (E) is provided with a first oil passage (5), a second oil passage (6), a third oil passage (7) and a fourth oil passage (8). The first oil passage (5) is used to connect the pump core oil outlet (3) with the filter oil inlet (1), the second oil passage (6) is used to connect the filter oil outlet (2) with the pressure regulator oil inlet, and the third oil passage (7) is used to connect the pump core oil outlet (3) with the injection oil inlet. end (4), the fourth oil passage (8) is used to connect the pressure regulator oil outlet and the injection oil inlet end (4), the fuel pump bracket (E) is provided with a fuel pump oil outlet nozzle (9) connected to the second oil passage (6), the outer ring of the fuel pump bracket (E) is provided with at least three bracket mounting hooks (10) for mounting the fuel pump bracket (E) in the oil pool, and the fuel pump bracket (E) is provided with a filter cover (11), a pressure regulator cover (12), an injection extension pipe (13) and at least two pump core mounting hooks (14) extending downwardly; The first oil passage (5), the second oil passage (6), the fourth oil passage (8) and the third oil passage (7) are surrounded by a quadrilateral. The filter cover (11), the pressure regulator cover (12) and the ejector extension pipe (13) are all arranged at three corners of the quadrilateral. A pump core oil outlet pipe (15) for communicating with the pump core oil outlet nozzle (3) is provided downwardly extending from the remaining corner of the quadrilateral. A one-way valve (16) is provided in the upper end of the pump core oil outlet pipe (15). The pump core mounting hook (14) is provided around the pump core oil outlet pipe (15). The filter cover (11) is in communication with the first oil passage (5), one end of the second oil passage (6) is downwardly extended to be provided with a filter oil outlet pipe (17) located in the filter cover (11) and for the filter oil outlet nozzle (2) to extend out, the other end of the second oil passage (6) is in communication with the pressure regulator cover (12), the fuel pump oil outlet nozzle (9) is arranged in the middle of the second oil passage (6), and one end of the fourth oil passage (8) is downwardly extended to be provided with a pressure regulator oil outlet pipe (18) located in the pressure regulator cover (12) and for the pressure regulator to discharge oil.

2. The fuel pump with integrated oil circuit according to claim 1, characterized in that: The filter (B) comprises a filter upper cover (19) and a filter bottom shell (20), a filter element (21) is arranged in the filter bottom shell (20), a middle portion of the filter upper cover (19) is provided with an oil inlet and outlet mounting protrusion (19a) extending upward, a middle portion of the oil inlet and outlet mounting protrusion (19a) is provided with an annular support protrusion (19b) for supporting the filter with a stop pin, a portion of the oil inlet and outlet mounting protrusion (19a) located below the support protrusion (19b) is a clamping portion for clamping the stop pin, the filter oil outlet nozzle (2) is provided in the middle portion of the oil inlet and outlet mounting protrusion (19a) and is communicated with the middle portion of the filter element (21), a plurality of filter oil inlets (1) are provided on the oil inlet and outlet mounting protrusion (19a) and are arranged around the filter oil outlet nozzle (2), and the filter oil inlet (1) is communicated with the outer ring of the filter element (21).

3. The fuel pump with integrated oil circuit according to claim 2, characterized in that: The upper end of the filter oil outlet nozzle (2) is higher than the upper end of the filter oil inlet (1).

4. The fuel pump with integrated oil circuit according to claim 2, characterized in that: The filter element (21) comprises filter paper (21a), a filter element upper cover (21b) arranged above the filter paper (21a), and a filter element lower cover (21c) arranged below the filter paper (21a); a filter element oil outlet hole (21d) is arranged on the filter element upper cover (21b) at a position corresponding to the filter oil outlet nozzle (2); the lower end of the filter oil outlet nozzle (2) extends into the upper end of the filter element oil outlet hole (21d), and an upper sealing ring is arranged between the upper end of the filter element oil outlet hole (21d) and the lower end of the filter oil outlet nozzle (2).

5. The fuel pump with integrated oil circuit according to claim 4, characterized in that: A gap for fuel to pass through is left between the filter element upper cover (21b) and the filter paper (21a) and the filter bottom shell (20), and a lower sealing ring is provided between the filter element lower cover (21c) and the filter bottom shell (20).

6. The fuel pump with integrated oil circuit according to claim 1, characterized in that: The fuel pump bracket (E) comprises a bracket body (22) and an oil passage cover (23) arranged above the bracket body (22); the fuel pump nozzle (9) is arranged on the oil passage cover (23).

7. The fuel pump with integrated oil circuit according to claim 1, characterized in that: The outer ring of the fuel pump bracket (E) is provided with a right-angled edge (24) facing upwards for easy installation.

8. The fuel pump with integrated oil circuit according to claim 1, characterized in that: Three evenly distributed rubber pads (25) are provided below the oil pool (A).

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