High-pressure common-rail fuel injector

Abstract

According to the high-pressure common-rail oil injector, through an innovative electromagnetic valve wire leading-out method, only fewest parts need to be reserved for an electromagnetic valve, a series of parts such as adapters and supports are omitted, the whole injection molding process is omitted, and therefore the purposes of simplifying the structure and reducing the cost are achieved.

Description

Technical Field

[0001] The present invention relates to an engine fuel injector, and more particularly to a common rail fuel injector at high pressure. Background Art

[0002] A common rail fuel injector for engine fuel injection is a device that controls the opening and closing of fuel injection of the injector by a solenoid valve to control a valve-controlled nozzle device.

[0003] The solutions provided in Application No. 2024113875382, 2024224051555, 2024119564438, 2024232557446, 2025105695062, and 202520861024X all adopt a structure in which the solenoid valve sinks above the valve-controlled nozzle device.

[0004] Generally, the method of leading out the wiring of the solenoid valve outside the injector housing is relatively complex. In addition to the necessary iron core, coil, wire, and terminal / quick-connect pin, it also includes a series of adapters, brackets, and other components, and finally an integrated solenoid valve assembly is made through integral injection molding. Such a structural method is complex in structure and high in cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a common rail fuel injector at high pressure, and through an innovative method of leading out the solenoid valve wire, the purpose of simplifying the structure and reducing the cost is achieved.

[0006] To achieve this purpose, the present invention adopts the following technical solutions.

[0007] The present invention provides a common rail fuel injector at high pressure, including a housing, a solenoid valve, and a valve-controlled nozzle device. The solenoid valve is sunk and arranged above the valve-controlled nozzle device, and the energization and de-energization of the solenoid valve control the opening and closing of fuel injection of the valve-controlled nozzle device.

[0008] A wiring channel is arranged inside the housing.

[0009] A PCB wiring board is installed on the housing. At least one set of wiring points and the same number of sets of external connectors are arranged on the PCB wiring board, and the wiring points and the corresponding external connectors are kept electrically connected.

[0010] The wire of the solenoid valve passes through the wiring channel and extends outside the housing, is electrically connected to the wiring point on the PCB wiring board, and then is electrically connected to the external connector.

[0011] With such a structure, the solenoid valve only needs to retain the fewest components, omitting a series of components such as adapters and brackets, and also omitting the integral injection molding process.

[0012] Preferably, the wiring point is electrically connected to the external connector by welding.

[0013] Preferably, a sealing plug is installed on the housing, and the electric wire passes through the sealing plug and extends out of the housing. The sealing plug seals the wiring channel and the electric wire, isolating the interior of the housing from the external space.

[0014] Preferably, the PCB wiring board is fixed to the housing by welding. The structure is simplified, which is beneficial to cost reduction.

[0015] Preferably, the PCB wiring board seals the housing, enclosing the wiring channel and the electric wire inside the housing, isolating the interior of the housing from the external space.

[0016] Preferably, a sealing ring is provided between the PCB wiring board and the housing. The sealing ring seals the housing, enclosing the wiring channel and the electric wire inside the housing, isolating the interior of the housing from the external space.

[0017] Preferably, the form of the external joint is a threaded post or a quick-insert pin.

[0018] Preferably, the periphery of the electric wire is coated with an insulating protective sleeve. This prevents wire abrasion and short circuits, achieving protection of the electric wire.

[0019] Preferably, the housing includes at least one oil return port, and the oil return port communicates with the wiring channel. The oil return is led out from the wiring channel, simplifying the housing structure and also facilitating the fuel to flow through the solenoid valve to cool the solenoid valve.

[0020] Preferably, the number of the oil return ports is two. Between multiple high-pressure common rail injectors on the same engine, the oil return ports are connected in series end to end through a hose. This provides convenience for the connection of the engine's oil return pipeline.

[0021] Advantages of the present invention: Through an innovative method for leading out the electric wire of the solenoid valve, the solenoid valve only needs to retain the fewest components, omitting a series of components such as adapters and brackets, and also omitting the overall injection molding process, thereby achieving the purpose of simplifying the structure and reducing the cost. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of a high-pressure common rail injector according to Embodiment 1 of the present invention.

[0023] Figure 2 is a schematic structural diagram of a high-pressure common rail injector according to Embodiment 2 of the present invention.

[0024] Figure 3 is a schematic structural diagram of a high-pressure common rail injector according to Embodiment 3 of the present invention.

[0025] In the figure: 1 - housing 1; 1a - oil inlet; 1b - wiring channel; 1c - oil return port; 3 - valve control nozzle device; 4 - insulation protection sleeve; 5 - wire; 6 - sealing plug; 7 - PCB wiring board; 7a - wiring point; 7b - external connector; 7c - welding wire; 8 - sealing ring. Detailed implementation mode

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0027] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for differentiation in description and do not have special meanings. Embodiment 1

[0030] As Figure 1 shown, there is a pen-shaped high-pressure common rail injector, including a housing 1, an electromagnetic valve 2, and a valve control nozzle device 3. The electromagnetic valve 2 is disposed below and above the valve control nozzle device 3, and the energization and de-energization of the electromagnetic valve 2 control the opening and closing of the fuel injection of the valve control nozzle device 3.

[0031] This pen-shaped high-pressure common rail injector has a smaller outer diameter, and the fuel inlet 1a of the injector is arranged at the top of the housing 1.

[0032] A wiring channel 1b is arranged inside the housing 1.

[0033] A PCB wiring board 7 is installed on the housing 1. Two sets of wiring points 7a and the same number of external connectors 7b are arranged on the PCB wiring board 7, and an electrical connection is maintained between each set of wiring points 7a and the corresponding external connector 7b.

[0034] The wire 5 of the solenoid valve 2 passes through the wiring channel 1b and extends outside the housing 1, and is electrically connected to the wiring point 7a on the PCB wiring board 7, and then is electrically connected to the external connector 7b.

[0035] As can be seen from the figure, the solenoid valve only needs to retain the minimum number of components, omitting a series of components such as adapters and brackets, and also omitting the overall injection molding process.

[0036] The wiring point 7a is electrically connected to the external connector 7b by welding.

[0037] A sealing plug 6 is installed on the housing 1. The wire 5 passes through the sealing plug 6 and extends outside the housing 1. The sealing plug 6 seals the wiring channel 1b and the wire 5, and isolates the inside and outside spaces of the housing 1.

[0038] The PCB wiring board 7 is fixed on the housing 1 by welding, as shown by the welding wire 7c.

[0039] The external connector 7b is in the form of a threaded post.

[0040] The wire 5 is surrounded by an insulating protective sleeve 4 to prevent wire wear and short circuit and protect the wire.

[0041] The housing 1 includes an oil return port 1c, and the oil return port 1c communicates with the wiring channel 1b. The oil return is led out from the wiring channel, which simplifies the housing structure and is also beneficial to the fuel flowing through the solenoid valve to cool the solenoid valve. Embodiment 2

[0042] As Figure 2 shown is another pen-shaped high-pressure common rail injector, which is different from the previous embodiment as follows.

[0043] The external connector 7b is in the form of a quick-insert pin.

[0044] The number of the oil return ports 1c is two. Between multiple high-pressure common rail injectors on the same engine, the oil return ports 1c are connected in series end to end through a hose, which provides convenience for the connection of the oil return pipeline of the engine. Embodiment 3

[0045] As shown Figure 3 in the figure is a medium and heavy-duty high-pressure common rail injector. The fuel inlet 1a of the injector is arranged in the middle of the housing 1, which is suitable for an engine that requires a mid-mounted layout. There are the following differences in structure from the foregoing embodiment.

[0046] The PCB wiring board 7 seals the housing 1, encloses the wiring channel 1b and the electric wire 5 inside the housing 1, and isolates the interior of the housing 1 from the external space.

[0047] To further improve the sealing reliability, a sealing ring 8 is provided between the PCB wiring board 7 and the housing 1. The sealing ring 8 seals the housing 1, encloses the wiring channel 1b and the electric wire 5 inside the housing 1, and isolates the interior of the housing 1 from the external space.

[0048] The form of the sealing ring 8 here is not limited to the narrow sense of the O-ring. Alternative solutions with sealing functions including but not limited to sealant, flat gasket, etc. should also fall within the protection scope of the claims of the present invention.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A high-pressure common rail injector, comprising a housing (1), a solenoid valve (2), and a valve-controlled nozzle device (3). The solenoid valve (2) is disposed in a sunken manner above the valve-controlled nozzle device (3). The energization and de-energization of the solenoid valve (2) control the opening and closing of fuel injection of the valve-controlled nozzle device (3). It is characterized in that: A wiring channel (1b) is provided inside the housing (1); A PCB wiring board (7) is installed on the housing (1). At least one set of wiring points (7a) and the same number of external connectors (7b) are provided on the PCB wiring board (7). Electrical connection is maintained between the wiring points (7a) and the corresponding external connectors (7b); The wire (5) of the solenoid valve (2) passes through the wiring channel (1b) and extends outside the housing (1), and is electrically connected to the wiring point (7a) on the PCB wiring board (7), and then electrically connected to the external connector (7b).

2. The high-pressure common rail fuel injector according to claim 1, characterized in that: The wiring point (7a) is electrically connected to the external connector (7b) by welding.

3. A high-pressure common rail injector according to claim 1, characterized in that: A sealing plug (6) is installed on the housing (1). The wire (5) passes through the sealing plug (6) and extends outside the housing (1). The sealing plug (6) seals the wiring channel (1b) and the wire (5), and isolates the internal and external spaces of the housing (1).

4. A high-pressure common rail injector according to claim 1, characterized in that: The PCB wiring board (7) is fixed to the housing (1) by welding.

5. The high-pressure common rail injector according to claim 1, characterized in that: The PCB wiring board (7) seals the housing (1), encloses the wiring channel (1b) and the wire (5) inside the housing (1), and isolates the internal and external spaces of the housing (1).

6. A high-pressure common rail fuel injector according to claim 1, characterized in that: A sealing ring (8) is provided between the PCB wiring board (7) and the housing (1). The sealing ring (8) seals the housing (1), encloses the wiring channel (1b) and the wire (5) inside the housing (1), and isolates the internal and external spaces of the housing (1).

7. A high-pressure common rail injector according to claim 1, characterized in that: The form of the external connector (7b) is a threaded post or a quick-insert pin.

8. The high-pressure common-rail injector according to claim 9, characterized in that: An insulating protective sleeve (4) is covered around the wire (5).

9. A high-pressure common rail injector according to claim 1, characterized in that: The housing (1) includes at least one oil return port (1c), and the oil return port (1c) communicates with the wiring channel (1b).

10. A high-pressure common rail fuel injector according to claim 9, characterized in that: The number of the oil return ports (1c) is 2. Between multiple high-pressure common rail injectors on the same engine, the oil return ports (1c) are connected in series end to end through a hose.

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