Fuel pump and engine

Abstract

The utility model relates to the technical field of engines, and discloses a fuel pump and an engine, the fuel pump comprises a pump body, the pump body comprises a shell and a working shaft, the shell is internally provided with a working cavity, and the working shaft is rotatably arranged in the working cavity in a penetrating mode; the locking structure is arranged on the outer shell and provided with a locking end penetrating through the working cavity, and the locking end is used for being matched with the working shaft in a limiting mode. When the fuel pump is assembled, the working shaft is rotated to a designated assembling position, at the moment, the working shaft is fixed through the locking structure, and therefore the fuel pump can be assembled conveniently. When a subsequent oil pump gear and a transmission gear are assembled, due to the fact that the oil pump gear and the working shaft cannot rotate at will after being assembled, the oil pump gear can be effectively prevented from being driven by the transmission gear to deflect when being assembled, and stability and reliability of the fuel pump assembly process are improved. And the possibility of timing errors is reduced.

Description

Technical Field

[0001] The utility model relates to the field of engines, in particular to a fuel pump and an engine. Background Art

[0002] The engine's fuel pump is a crucial component in a vehicle's fuel delivery system, pumping fuel from the fuel tank and delivering it to the injectors or carburetor through fuel lines. Fuel pump timing refers to the coordination between the fuel pump and the engine's valve timing, ensuring that fuel is delivered to the cylinders at the correct time. To ensure reliable fuel pump assembly timing, markings are typically placed on the pump gear and gear train to ensure accurate assembly positioning.

[0003] At present, when the existing fuel pump is assembled, the camshaft inside it is usually in a state where it can rotate freely. The oil pump gear is assembled and connected to the camshaft and rotates together. When the oil pump gear is assembled with the transmission gear, the oil pump gear is easily driven by the transmission gear to rotate. When the oil pump gear rotates, it will drive the camshaft to rotate, which will cause the camshaft to deviate from its initial position, and then cause the fuel pump timing error, resulting in poor assembly reliability. Utility Model Content

[0004] In view of this, the utility model provides a fuel pump and an engine to solve the problem of poor assembly reliability in the structural form of the existing fuel pump.

[0005] In the first aspect, the utility model provides a fuel pump, comprising: a pump body, comprising an outer shell and a working shaft, the outer shell having a working chamber, the working shaft rotatably passing through the working chamber; a locking structure, arranged on the outer shell and having a locking end passing through the working chamber, the locking end being used to cooperate with the working shaft in a limiting manner.

[0006] Beneficial effect: A locking structure is provided on the outer shell of the pump body. When the fuel pump is assembled, the working shaft is rotated to the specified assembly position. At this time, the working shaft is fixed by the locking structure, so that the working shaft cannot rotate along the axis. When the oil pump gear and the transmission gear are subsequently assembled, since the oil pump gear and the working shaft cannot rotate at will after being assembled, the deflection of the oil pump gear driven by the transmission gear during assembly can be effectively avoided, thereby improving the stability and reliability of the fuel pump assembly process, reducing the possibility of timing errors, and effectively solving the problem of poor assembly reliability of the existing fuel pump structure.

[0007] In an optional embodiment, a locking hole is provided on the outer wall of the housing, the locking hole is communicated with the working chamber, and the locking structure is detachably arranged in the locking hole.

[0008] Beneficial effects: With this arrangement of the locking structure, after the locking structure is removed from the locking hole, the working shaft can be directly observed through the locking hole. After the fuel pump is integrated into the engine and the engine phase needs to be checked, the engine can be cranked to the top dead center position of the engine piston and the state of the working shaft can be directly observed through the locking hole to quickly determine whether the injection timing is assembled correctly.

[0009] In an optional embodiment, the locking structure includes a locking seat and a locking column, the locking column is arranged at one end of the locking seat, and the end of the locking column away from the locking seat is the locking end.

[0010] Beneficial effects: The locking structure is simple and reliable, and is easy to process and manufacture.

[0011] In an optional embodiment, a matching structure is provided on the working shaft, and the locking column abuts and matches with the matching structure.

[0012] Beneficial effects: The limiting fit form is simple and reliable, and has little impact on the structural strength of the working shaft.

[0013] In an optional embodiment, the locking seat includes a first seat segment, a second seat segment and a third seat segment connected in sequence, the first seat segment, the second seat segment and the third seat segment are arranged in sequence in a direction away from the locking column, the inner wall of the locking hole is provided with an internal thread, and the outer peripheral surfaces of the first seat segment and the third seat segment are respectively provided with external threads.

[0014] Beneficial effect: When there is no need to lock the working shaft, the locking structure is flipped to the position where the locking column is located outside, and the locking seat can be screwed into the locking hole through its own third seat section, which can not only block the locking hole, but also effectively prevent the locking column from contacting the working shaft.

[0015] In an optional embodiment, the second seat segment is prismatic.

[0016] Beneficial effect: This type of second seat section is more convenient to cooperate with the disassembly tool, so that the locking structure can be disassembled more easily and quickly.

[0017] In an optional embodiment, the fuel pump also includes a connecting flange and an oil pump gear. One end of the working shaft passes through the outer shell and forms a connecting end. The end of the outer shell corresponding to the connecting end forms an assembly end. The connecting flange is detachably assembled on the connecting end. The connecting end passes through the connecting flange and is assembled and connected to the oil pump gear.

[0018] Beneficial effects: The structure is simple, easy to manufacture and install, and the connecting flange can effectively protect the oil pump gear.

[0019] In an optional embodiment, the shell and the connecting flange are assembled to form a fitting seam, a first identification structure is provided on the outer wall of the shell near the fitting seam, and a second identification structure is provided on the outer wall of the connecting flange near the fitting seam.

[0020] Beneficial effect: When assembling the connecting flange, aligning the second identification structure with the first identification structure can ensure the accuracy and reliability of its own installation position, which is more convenient for the subsequent oil pump gear assembly process and can effectively avoid the situation where the oil pump gear cannot be installed due to position deviation of the connecting flange.

[0021] In an optional embodiment, a third identification structure is provided at an edge of the end surface of the oil pump gear away from the housing.

[0022] Beneficial effect: When assembling the oil pump gear, the angle between the third identification structure and the second identification structure can be fine-tuned according to the injection advance angle of the engine, which can not only ensure the accuracy of installation, but also facilitate flexible adjustment of the rotation angle of the oil pump gear.

[0023] In a second aspect, the present invention further provides an engine, which comprises: an engine body; and the above-mentioned fuel pump, which is assembled and connected to the engine body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of an explosion of a fuel pump according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 Front view of the locking structure of the fuel pump shown

[0027] Figure 3 for Figure 1 The enlarged schematic diagram of point A of the fuel pump is shown;

[0028] Figure 4 for Figure 1 The enlarged schematic diagram of point A of the fuel pump is shown;

[0029] Figure 5 for Figure 1 An enlarged schematic diagram of point A of the fuel pump is shown.

[0030] Description of reference numerals:

[0031] 1. Pump body; 101. Housing; 1011. Assembly end; 102. Working shaft; 1021. Connecting end; 103. Locking hole; 104. First identification structure;

[0032] 2. Locking structure; 201. Locking end; 202. Locking seat; 2021. First seat segment; 2022. Second seat segment; 2023. Third seat segment; 203. Locking post;

[0033] 3. Connecting flange; 301. Second identification structure; 4. Oil pump gear; 401. Third identification structure. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The following combination Figures 1 to 5 , describing the embodiments of the present utility model.

[0036] According to an embodiment of the present utility model, on the one hand, a fuel pump is provided, which includes: a pump body 1 and a locking structure 2, the pump body 1 includes an outer shell 101 and a working shaft 102, the outer shell 101 has a working chamber inside, the working shaft 102 is rotatably inserted into the working chamber, the locking structure 2 is arranged on the outer shell 101 and has a locking end 201 inserted into the working chamber, and the locking end 201 is used to limit the working shaft 102.

[0037] The fuel pump using this embodiment is provided with a locking structure 2 on the outer shell 101 of the pump body 1. When the fuel pump is assembled, the working shaft 102 is rotated to the specified assembly position. At this time, the working shaft 102 is fixed by the locking structure 2, so that the working shaft 102 cannot rotate along the axis. When the oil pump gear and the transmission gear are subsequently assembled, since the oil pump gear and the working shaft 102 cannot rotate at will after being assembled, the deflection of the oil pump gear caused by the transmission gear during assembly can be effectively avoided, thereby improving the stability and reliability of the fuel pump assembly process, reducing the possibility of timing errors, and effectively solving the problem of poor assembly reliability of the existing fuel pump structure.

[0038] It should be noted that the working shaft 102 is a camshaft.

[0039] Furthermore, when the oil pump gear and the transmission gear both have straight teeth, the oil pump gear is less likely to deflect when the two are assembled. However, when the oil pump gear and the transmission gear both have helical teeth, the oil pump gear is more likely to deflect when the two are matched. Since helical gears have better force transmission performance, the oil pump gear and the transmission gear are mostly helical teeth. The fuel pump of this embodiment can effectively avoid the problem of the working shaft 102 deflecting when the oil pump gear and the transmission gear are assembled.

[0040] In one possible embodiment, a locking hole 103 is provided on the outer wall of the housing 101, and the locking hole 103 is connected to the working chamber. The locking structure 2 is detachably arranged in the locking hole 103. With this arrangement of the locking structure 2, after the locking structure 2 is removed from the locking hole 103, the working shaft 102 can be directly observed through the locking hole 103. After the fuel pump is integrated into the engine and the engine phase needs to be checked, the state of the working shaft 102 can be directly observed through the locking hole 103 by turning the engine to the top dead center position of the engine piston, so as to quickly determine whether the injection timing is assembled correctly.

[0041] It is understandable that, as an alternative embodiment, the locking hole 103 may not be provided, and the locking structure 2 may be provided on the inner wall of the working chamber, and the locking state of the locking structure 2 may be switched by a control rod passing through the housing 101 through the locking structure 2.

[0042] There is no limitation on the size of the locking hole 103 , which may be circular, square, etc. The actual size can be flexibly selected according to the use requirements.

[0043] In one possible embodiment, the locking structure 2 includes a locking seat 202 and a locking column 203. The locking column 203 is arranged at one end of the locking seat 202. The end of the locking column 203 away from the locking seat 202 is the locking end 201. The locking structure 2 is simple and reliable in form and easy to process and manufacture.

[0044] There is no limitation on the specific shapes of the locking seat 202 and the locking column 203 . The locking seat 202 and the locking column 203 can be cylindrical, prismatic or other structural forms, which can be flexibly selected.

[0045] In a possible embodiment, a matching structure is provided on the working shaft 102 , and the locking column 203 is in abutment with the matching structure. The limiting matching form is simple and reliable, and has little impact on the outer wall of the working shaft 102 .

[0046] It can be understood that as an alternative embodiment, the matching structure may not be provided, and the locking column 203 directly abuts against the outer wall of the working shaft 102. This matching form does not require any modification to the structure of the working shaft 102 and can directly fix the circumferential position of the working shaft 102.

[0047] Among them, there is no limitation on the specific matching position of the locking structure 2 and the working shaft 102. The locking end 201 can be in abutment with the tooth key of the working shaft 102, or can be directly in abutment with the outer peripheral surface of the working shaft 102, or a positioning hole can be opened on the outer periphery of the working shaft 102, and the locking end 201 can be plugged into the positioning hole.

[0048] Preferably, the matching structure is a tooth key, and the locking end 201 of the locking structure 2 is in abutment with the tooth key of the working shaft 102, which also makes it easy to judge the circumferential position of the working shaft 102 by observing the position of the tooth key.

[0049] In one possible implementation, Figure 2 As shown, the locking seat 202 includes a first seat segment 2021, a second seat segment 2022 and a third seat segment 2023 connected in sequence. The first seat segment 2021, the second seat segment 2022 and the third seat segment 2023 are arranged in sequence along the direction away from the locking column 203. The inner wall of the locking hole 103 is provided with an internal thread, and the outer peripheral surfaces of the first seat segment 2021 and the third seat segment 2023 are respectively provided with external threads. The locking seat 202 can assemble and connect the first seat segment 2021 and the third seat segment 2023 with the locking hole 103 respectively. The connection form is simple and reliable. When there is no need to lock the working shaft 102, the locking structure 2 is flipped to the position where the locking column 203 is located outside. The locking seat 202 can be screwed into the locking hole 103 through its own third seat segment 2023, which can not only block the locking hole 103, but also effectively prevent the locking column 203 from contacting the working shaft 102.

[0050] Specifically, if Figure 2 As shown, in order to prevent the first seat segment 2021 and the third seat segment 2023 from being screwed too deeply into the locking hole 103, the connecting surface between the second seat segment 2022 and the first seat segment 2021 and the connecting surface between the second seat segment 2022 and the first seat segment 2021 both form step surfaces, which are used to abut and cooperate with the outer wall of the shell 101.

[0051] In a possible implementation manner, the second seat segment 2022 is prismatic. This type of second seat segment 2022 is more convenient to cooperate with a disassembly tool, so that the locking structure 2 can be disassembled more easily and quickly.

[0052] There is no limitation on the number of prisms of the second seat segment 2022 , and the number can be triangular prisms, quadrangular prisms, pentagonal prisms, hexagonal prisms or more, which can be selected according to needs.

[0053] In a possible embodiment, the fuel pump also includes a connecting flange 3 and an oil pump gear 4. One end of the working shaft 102 passes through the outer shell 101 and forms a connecting end 1021. The end of the outer shell 101 corresponding to the connecting end 1021 forms an assembly end 1011. The connecting flange 3 can be detachably assembled on the connecting end 1021. The connecting end 1021 passes through the connecting flange 3 and is assembled and connected to the oil pump gear 4. The structure is simple and easy to manufacture and install. The connecting flange 3 can effectively protect the oil pump gear 4.

[0054] In one possible embodiment, the outer shell 101 is assembled with the connecting flange 3 to form a fitting seam, and a first identification structure 104 is provided on the outer wall of the outer shell 101 near the fitting seam, and a second identification structure 301 is provided on the outer wall of the connecting flange 3 near the fitting seam. When the connecting flange 3 is assembled, the second identification structure 301 is aligned with the first identification structure 104 to ensure the accuracy and reliability of its own installation position, which is more convenient for the subsequent assembly process of the oil pump gear 4 and can effectively avoid the situation where the oil pump gear 4 cannot be installed after the connecting flange 3 has a position deviation.

[0055] Specifically, there is no limitation on the specific forms of the first identification structure 104 and the second identification structure 301. They can be recessed structures, protruding structures, dot-shaped structures, or linear structures, and can be flexibly selected according to usage requirements and processing convenience.

[0056] Preferably, the first identification structure 104 is a linear groove, and the second identification structure 301 is a linear mark.

[0057] In one possible embodiment, a third identification structure 401 is provided at the edge of the end face of the oil pump gear 4 away from the housing 101. When the oil pump gear 4 is assembled, the angle between the third identification structure 401 and the second identification structure 301 can be fine-tuned accordingly according to the injection advance angle of the engine. The relative positions of the three marks of the first identification structure 104, the second identification structure 301 and the third identification structure 401 are fixed, which can not only ensure the accuracy of the installation, but also facilitate the flexible adjustment of the rotation angle of the oil pump gear 4.

[0058] In a possible implementation manner, a keyway is provided on the outer wall of the connecting end 1021 , and the oil pump gear 4 is in transmission engagement with the connecting end 1021 via a connecting key.

[0059] According to an embodiment of the present invention, on the other hand, an engine is provided, which includes: an engine body and the above-mentioned fuel pump, wherein the fuel pump is assembled and connected to the engine body.

[0060] In this embodiment, the engine also includes necessary components such as a connecting rod assembly, a crankshaft flywheel assembly, etc.

[0061] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A fuel pump, characterized in that: include: The pump body (1) comprises a shell (101) and a working shaft (102); the shell (101) has a working chamber inside, and the working shaft (102) is rotatably disposed in the working chamber; A locking structure (2) is provided on the housing (101) and has a locking end (201) penetrating the working cavity, wherein the locking end (201) is used for position-limiting cooperation with the working shaft (102).

2. The fuel pump according to claim 1, characterized in that A locking hole (103) is provided on the outer wall of the housing (101), the locking hole (103) is communicated with the working chamber, and the locking structure (2) is detachably arranged in the locking hole (103).

3. The fuel pump according to claim 2, characterized in that The locking structure (2) comprises a locking seat (202) and a locking column (203), wherein the locking column (203) is arranged at one end of the locking seat (202), and the end of the locking column (203) away from the locking seat (202) is the locking end (201).

4. The fuel pump according to claim 3, characterized in that A matching structure is provided on the working shaft (102), and the locking column (203) is in abutment with the matching structure.

5. The fuel pump according to claim 3, characterized in that The locking seat (202) comprises a first seat segment (2021), a second seat segment (2022) and a third seat segment (2023) connected in sequence, wherein the first seat segment (2021), the second seat segment (2022) and the third seat segment (2023) are arranged in sequence in a direction away from the locking column (203), the inner wall of the locking hole (103) is provided with an internal thread, and the outer peripheral surfaces of the first seat segment (2021) and the third seat segment (2023) are respectively provided with an external thread.

6. The fuel pump according to claim 5, characterized in that The second seat section (2022) is prismatic.

7. The fuel pump according to any one of claims 1 to 6, characterized in that The fuel pump further comprises a connecting flange (3) and an oil pump gear (4); one end of the working shaft (102) passes through the housing (101) and forms a connecting end (1021); an end of the housing (101) corresponding to the connecting end (1021) forms an assembly end (1011); the connecting flange (3) is detachably assembled to the connecting end (1021); the connecting end (1021) passes through the connecting flange (3) and is assembled and connected to the oil pump gear (4).

8. The fuel pump according to claim 7, characterized in that The shell (101) and the connecting flange (3) are assembled to form a fitting seam, a first identification structure (104) is provided on the outer wall of the shell (101) close to the fitting seam, and a second identification structure (301) is provided on the outer wall of the connecting flange (3) close to the fitting seam.

9. The fuel pump according to claim 8, characterized in that A third identification structure (401) is provided at an edge position of the end surface of the oil pump gear (4) away from the housing (101).

10. An engine, characterized in that: include: body; The fuel pump according to any one of claims 1 to 9, assembled and connected to the engine body.

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