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 application relates to an engine fuel injector, in particular a high-pressure common rail injector. BACKGROUND

[0002] The high-pressure common rail injector for engine fuel injection is a device that controls a valve-controlled nozzle device through a solenoid valve to realize the opening and closing of the injector.

[0003] The solutions given in application numbers 2024113875382, 2024224051555, 2024119564438, 2024232557446, 2025105695062, and 202520861024X all adopt a structure in which the solenoid valve is sunken above the valve-controlled nozzle device.

[0004] Generally, the way the solenoid valve leads out of the injector housing is complex, in addition to the necessary core, coil, wire, and terminal pin, it also contains a series of adapters, brackets, and other components, and finally an overall injection molding is made into a solenoid valve assembly. Such a structure, complex structure, high cost. SUMMARY

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

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

[0007] The present application provides a high-pressure common rail injector, comprising a housing, a solenoid valve, and a valve-controlled nozzle device, the solenoid valve is sunken above the valve-controlled nozzle device, and the energization and de-energization of the solenoid valve controls the opening and closing of the valve-controlled nozzle device.

[0008] The housing is provided with a wire passage.

[0009] The housing is provided with a PCB terminal board, the PCB terminal board is provided with at least one group of terminal points and the same number of external terminals, and the terminal points and the corresponding external terminals are electrically connected.

[0010] The wire of the solenoid valve passes through the wire passage and extends out of the housing, and is electrically connected to the terminal point on the PCB terminal board, and then electrically connected to the external terminal.

[0011] Such a structure, the solenoid valve only needs to retain the minimum components, omitting a series of adapters, brackets, and other components, and also omitting the overall injection molding process.

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

[0013] Preferably, a sealing plug is mounted on the shell, and the electric wire extends out of the shell through the sealing plug, which seals the wiring channel and the electric wire and separates the interior of the shell from the external space.

[0014] Preferably, the PCB wiring board is fixed to the shell by welding, which simplifies the structure and reduces the cost.

[0015] Preferably, the PCB wiring board seals the shell, and the wiring channel and the electric wire are enclosed in the shell, which separates the interior of the shell from the external space.

[0016] Preferably, a sealing ring is arranged between the PCB wiring board and the shell, which seals the shell, and the wiring channel and the electric wire are enclosed in the shell, which separates the interior of the shell from the external space.

[0017] Preferably, the external connector is in the form of a threaded column or a quick plug.

[0018] Preferably, the electric wire is surrounded by an insulating protective sleeve, which prevents the electric wire from being abraded and short-circuited and protects the electric wire.

[0019] Preferably, the shell comprises at least one oil return port, which is connected to the wiring channel. The oil return port is used to guide the oil return from the wiring channel, which simplifies the structure of the shell and facilitates the flow of fuel through the electromagnetic valve to cool the electromagnetic valve.

[0020] Preferably, the number of oil return ports is two, and the oil return ports are connected in series through a hose between multiple high-pressure common rail injectors on the same engine, which facilitates the connection of the oil return pipeline of the engine.

[0021] Advantages of the present application:

[0022] By the innovative method of leading out the electric wire of the electromagnetic valve, the electromagnetic valve only needs to retain the minimum components, and a series of adapters and supports are omitted, and the overall injection molding process is also omitted, so that the structure is simplified, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a high-pressure common rail injector structure schematic diagram of embodiment one of the present application.

[0024] Figure 2 is a high-pressure common rail injector structure schematic diagram of embodiment two of the present application.

[0025] Figure 3 is a high-pressure common rail injector structure schematic diagram of embodiment three of the present application.

[0026] In the figure: 1 - housing 1; 1a - oil inlet; 1b - wiring channel; 1c - oil return port; 3 - valve control nozzle device; 4 - insulation protective sleeve; 5 - electric wire; 6 - sealing plug; 7 - PCB wiring board; 7a - wiring point; 7b - external connector; 7c - soldering wire; 8 - sealing ring. DETAILED DESCRIPTION

[0027] The application will be further described below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are intended to be merely illustrative of the application and not in limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the application are shown in the drawings rather than all the parts.

[0028] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning. Example one

[0031] As Figure 1 shown is a pen-shaped high-pressure common rail oil injector, comprising a housing 1, an electromagnetic valve 2 and a valve control nozzle device 3. The electromagnetic valve 2 is arranged below the valve control nozzle device 3. The energization and de-energization of the electromagnetic valve 2 controls the opening and closing of the valve control nozzle device 3.

[0032] The pen-shaped high-pressure common rail fuel injector has a small outer diameter, and the oil inlet 1a of the fuel injector is arranged at the top of the shell 1.

[0033] The shell 1 is provided with a wiring channel 1b.

[0034] The shell 1 is provided with a PCB wiring board 7, and the PCB wiring board 7 is provided with two groups of wiring points 7a and the same number of external connectors 7b. Each group of wiring points 7a is electrically connected to the corresponding external connector 7b.

[0035] The electric wire 5 of the electromagnetic valve 2 extends out of the shell 1 through the wiring channel 1b, is electrically connected to the wiring point 7a on the PCB wiring board 7, and is further electrically connected to the external connector 7b.

[0036] As shown in the figure, the electromagnetic valve only needs to retain the minimum components, and a series of adapters and supports are omitted, and the overall injection molding process is also omitted.

[0037] The wiring point 7a is electrically connected to the external connector 7b by welding.

[0038] The shell 1 is provided with a sealing plug 6, and the electric wire 5 extends out of the shell 1 through the sealing plug 6. The sealing plug 6 seals the wiring channel 1b and the electric wire 5, and isolates the inside of the shell 1 from the outside space.

[0039] The PCB wiring board 7 is fixed to the shell 1 by welding, and the welding line 7c is shown in the figure.

[0040] The external connector 7b is in the form of a threaded column.

[0041] The electric wire 5 is surrounded by an insulating protective sleeve 4. The electric wire is prevented from being abraded and short-circuited, and the electric wire is protected.

[0042] The shell 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 shell structure and is also beneficial to the fuel flowing through the electromagnetic valve to cool the electromagnetic valve. Embodiment two

[0043] As Figure 2 Another pen-shaped high-pressure common rail fuel injector is shown, which is different from the foregoing embodiments.

[0044] The external connector 7b is in the form of a quick plug needle.

[0045] The number of oil return ports 1c is two, and the oil return ports 1c of multiple high-pressure common rail fuel injectors on the same engine are connected in series through a hose. This provides convenience for the connection of the engine oil return pipeline. Embodiment three

[0046] As Figure 3 The middle and heavy type high pressure common rail oil injector is shown, the oil inlet 1a of the oil injector is arranged in the middle part of the shell 1, which is suitable for the engine which needs middle arrangement. The structure is different from the foregoing embodiments as follows.

[0047] The PCB terminal block 7 seals the shell 1, and the wiring channel 1b and the electric wire 5 are closed in the shell 1, which forms the isolation between the inside and the outside of the shell 1.

[0048] In order to further improve the sealing reliability, the sealing ring 8 is arranged between the PCB terminal block 7 and the shell 1, which seals the shell 1, and the wiring channel 1b and the electric wire 5 are closed in the shell 1, which forms the isolation between the inside and the outside of the shell 1.

[0049] The form of the sealing ring 8 is not limited to the narrow-sense O-shaped sealing ring, and the alternative solutions with sealing function such as sealing glue, flat sealing gasket and the like should also belong to the protection scope of the claims of the present application.

[0050] Obviously, the foregoing embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For the ordinary skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement made in the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A high-pressure common rail fuel injector, comprising a housing (1), an electromagnetic valve (2), and a valve-controlled nozzle device (3), the electromagnetic valve (2) being arranged to be sunken above the valve-controlled nozzle device (3), and the energization and de-energization of the electromagnetic valve (2) controlling the opening and closing of the valve-controlled nozzle device (3), characterized in that: a wiring passage (1b) is arranged in the housing (1); a PCB wiring board (7) is arranged on the housing (1), the PCB wiring board (7) being provided with at least one group of wiring points (7a) and the same number of external connectors (7b), the wiring points (7a) and the corresponding external connectors (7b) being electrically connected; the electric wire (5) of the electromagnetic valve (2) extends out of the housing (1) through the wiring passage (1b), and is electrically connected to the wiring points (7a) on the PCB wiring board (7), and further electrically connected to the external connectors (7b). The wiring points (7a) are electrically connected to the external connectors (7b) by welding. A sealing plug (6) is arranged on the housing (1), the electric wire (5) extends out of the housing (1) through the sealing plug (6), and the sealing plug (6) seals the wiring passage (1b) and the electric wire (5), and separates the inside of the housing (1) from the outside. The PCB wiring board (7) is fixed to the housing (1) by welding.

2. The high-pressure common-rail fuel injector according to claim 1, characterized in that: The PCB wiring board (7) seals the housing (1), and seals the wiring passage (1b) and the electric wire (5) in the housing (1), and separates the inside of the housing (1) from the outside.

3. The high-pressure common-rail fuel injector of claim 1, wherein: A sealing ring (8) is arranged between the PCB wiring board (7) and the housing (1), the sealing ring (8) seals the housing (1), and seals the wiring passage (1b) and the electric wire (5) in the housing (1), and separates the inside of the housing (1) from the outside.

4. The high-pressure common-rail fuel injector of claim 1, wherein: The external connectors (7b) are in the form of threaded columns or quick insertion pins.

5. The high-pressure common-rail fuel injector of claim 1, wherein: The electric wire (5) is surrounded by an insulating protective sleeve (4).

6. The high-pressure common-rail fuel injector of claim 1, wherein: The housing (1) comprises at least one oil return port (1c), and the oil return port (1c) communicates with the wiring passage (1b).

7. The high-pressure common-rail fuel injector of claim 1, wherein: The number of the oil return ports (1c) is two, and the oil return ports (1c) of multiple high-pressure common rail fuel injectors on the same engine are connected in series through a hose.

8. The high-pressure common-rail fuel injector of claim 1, wherein: ​ 9. The high-pressure common-rail fuel injector of claim 1, wherein: ​ 10. The high-pressure common-rail fuel injector of claim 9, wherein: ​

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