Wire-level wire diameter multi-turn coil outlet structure and electric control oil injector

Abstract

The wire-level wire diameter multi-turn coil outgoing structure comprises a coil framework and a contact pin, the coil framework provides a columnar surface used for winding an enameled wire, the wire-level wire diameter multi-turn coil outgoing structure further comprises a margin plate located at the end of the columnar surface, the margin plate is provided with a notch and a jack, and the notch is used for leading out the enameled wire; and the contact pin is matched with the jack, is used for winding the enameled wire led out from the notch and is electrically connected with the enameled wire. The invention further provides an electronic control fuel injector. The circumferential position of an electrical interface on a valve body of the electronic control fuel injector is generally consistent with the circumferential position of an insertion hole of the wire outlet structure. The structure can effectively solve the problem that the enameled wire is easy to break.

Description

Technical Field

[0001] The invention relates to the field of electronically controlled fuel injectors, and in particular to the field of lead-out structures of electromagnet windings. Background Art

[0002] The injector controls the relative position of the needle valve and the valve seat based on the electromagnetic control principle to achieve fuel injection control.

[0003] As the power density of diesel engines continues to increase, the compact design of key parts of electronically controlled fuel injectors, such as electromagnets, is particularly important. As the structure of the electromagnet becomes smaller and smaller, the geometric dimensions of the internal coil also become smaller. In order to meet the technical indicators of its electromagnetic force, response speed, etc., it is necessary to use thinner enameled wire to make the electromagnet winding. However, in a high-temperature, high-intensity vibration environment, too thin enameled wire is easy to break, and failures occur frequently, reducing the reliability of the fuel injector. Summary of the invention

[0004] An object of the present invention is to provide a wire-out structure with multiple turns of coils of wire-level diameter, which can effectively solve the problem of easy wire breakage of enameled wires.

[0005] To achieve the above-mentioned purpose, a multi-turn coil output structure with a silk-grade wire diameter includes a coil frame and a pin. The coil frame provides a cylindrical surface for winding the enameled wire, and also includes an edge plate located at the end of the cylindrical surface. The edge plate is provided with a notch and a plug hole. The notch is used to lead out the enameled wire; the pin cooperates with the plug hole to be used for winding the enameled wire led out from the notch and is electrically connected to the enameled wire.

[0006] In one or more embodiments, a boss is provided on the edge plate, and the insertion hole is arranged on the boss.

[0007] In one or more embodiments, the insertion hole and the notch are arranged adjacent to each other.

[0008] In one or more embodiments, the enameled wire wound around the pin includes a first part and a second part, the first part and the second part are respectively away from the edge plate, the enameled wire of the second part is welded and fixed to the pin after paint stripping, and the first part is not stripped.

[0009] In one or more embodiments, the structure further includes an insulating member located around the first portion, the second portion, and the outer periphery of the pin.

[0010] In one or more embodiments, the insulating parts of the first portion outer periphery and the second portion outer periphery are injection molded parts.

[0011] In one or more embodiments, the insulating member is a heat shrink tube.

[0012] In one or more embodiments, the first portion is a first circle of enameled wire wound around the pin.

[0013] In one or more embodiments, the boss is circumferentially movably disposed on the edge plate, and the edge plate further includes a plurality of notches.

[0014] Another object of the present invention is to provide an electronically controlled fuel injector, comprising a valve body, on which an electrical interface is provided, and also comprising the above-mentioned wire-level wire diameter multi-turn coil output structure, wherein the circumferential position of the jack of the output structure is close to the circumferential position of the electrical interface, or is consistent with the circumferential position of the electrical interface.

[0015] In one or more embodiments, the valve body is further provided with a wiring terminal for electrically connecting to the plug pin.

[0016] The above-mentioned silk-grade wire diameter multi-turn coil wire outlet structure is designed with a notch so that the enameled wire can be led out from the notch without being blocked by the edge plate, and the pin adjacent to the notch is designed so that the enameled wire can be directly wrapped around the pin and welded and fixed after being led out from the notch, thereby effectively increasing the connection strength; to prevent the wire from being torn off, the position of the pin is also consistent with the circumferential position of the electrical interface on the electronically controlled injector to adapt to the specific angle of the wire, further avoiding wire breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0018] Figure 1 It is a structural schematic diagram of an existing fuel injector;

[0019] Figure 2 It is a schematic diagram of the position of the electromagnet outlet structure in the valve body;

[0020] Figure 3 It is a schematic diagram of the electromagnet outlet structure;

[0021] Figure 4 is a schematic diagram of the coil skeleton;

[0022] Figure 5 It is a partial enlarged schematic diagram of the paint stripping section of the electromagnet winding.

[0023] Symbols and Markings

[0024] 1 Needle valve

[0025] 2 Armature

[0026] 3 Power plug

[0027] 4 Valve body

[0028] 5. Solenoid coil

[0029] 6 Spring

[0030] 7 Nozzle

[0031] 8 Enameled wire

[0032] 11 Coil skeleton

[0033] 12 pins

[0034] 13 Edge board

[0035] 14 Gap

[0036] 15 Socket

[0037] 16 Boss

[0038] 18 Heat shrink tubing

[0039] 19 Injection molded parts

[0040] 41 Electrical interface

[0041] 42 Wire

[0042] 43 Terminal Blocks

[0043] 110 cylindrical surface DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0045] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0046] Figure 1 The basic structure of the fuel injector is shown, including a needle valve 1, an armature 2, an electric plug 3, a valve body 4, an electromagnetic coil 5, a spring 6 and other structures.

[0047] When the engine control unit sends a signal, the electromagnetic coil 5 of the injector is energized to generate a magnetic field. The magnetic force of the electromagnet attracts the needle valve, overcomes the reaction force of the spring, and pushes the needle valve to move. This action causes the high-pressure fuel to be ejected from the injector nozzle 7 and enter the combustion chamber. The duration and amount of fuel injection are adjusted by the power-on time of the injector coil, the injection pulse width and other characteristics to meet different working conditions. When the coil is de-energized, the magnetic field disappears, the needle valve 1 is reset under the action of the spring 6, and the injection stops.

[0048] Therefore, the electronically controlled fuel injector solenoid valve is a complex nonlinear system that couples electromagnetic mechanics and hydraulic multi-physics fields. Its high-frequency response characteristics are the key factors to achieve accurate and controllable fuel injection and improve the economy and power of diesel engines. The current installation space is getting smaller and smaller, and the electromagnetic structure is required to have the characteristics of fast response speed and high reliability in a small space.

[0049] The electromagnet winding includes the iron core, winding, coil frame and other structures. The coil frame is generally made of non-magnetic or weakly magnetic materials, such as non-metal or copper, to support the winding. The winding is the wire wound on the coil frame, usually enameled wire or electromagnetic wire. The function of the winding is to provide current through the power supply. When the current passes through the winding, it will generate a magnetic field around the iron core.

[0050] As the electromagnet structure becomes smaller and smaller, the geometric size of the internal coil also becomes smaller. In order to meet the technical indicators of electromagnetic force, response speed, etc., it is necessary to use thinner enameled wire to make the electromagnet winding. However, the injector is mostly in a high temperature and high-intensity vibration environment, so if the enameled wire is too thin, it will easily be torn off, reducing the reliability of the injector and affecting the service life of the diesel.

[0051] Based on this problem, the present disclosure proposes a multi-turn coil output structure, which can overcome the problem that the electromagnetic coil of the electronically controlled fuel injector is easy to break.

[0052] Reference Figures 2 to 5 It is understood that the multi-turn coil outlet structure includes a coil frame 11 and one or more pins 12. The coil frame 11 provides a cylindrical surface 110 for winding the enameled wire. The coil frame 11 also includes an edge plate 13 located at the end of the cylindrical surface 110. The edge plate 13 is provided with one or more notches 14 and one or more plug holes 15. The notches 14 are used to lead out the enameled wire 8, and the plug holes 15 are used to insert the pins 12. In some embodiments, a boss 16 is provided on the edge plate 13, and the plug hole 15 is located in the boss 16. The boss 16 and the notch 14 are arranged adjacent to each other, so that the enameled wire led out from the notch can be directly wound onto the pin 12.

[0053] After the pin 12 is inserted into the insertion hole 15, it is used to be wound around the enameled wire 8 led out from the notch 14, so as to lead out the enameled wire 8, and the pin 12 is electrically connected to the enameled wire 8. The enameled wire 8 wound around the pin 12 includes a first portion A and a second portion B, and the first portion A and the second portion B are successively away from the edge plate 13, such as Figure 5 shown.

[0054] The enameled wire of the second part B is stripped and fixed to the pin 12 by soldering or other methods, while the first part A is not stripped. Since the enameled wire becomes thinner after being stripped, it is very easy to break during vibration in the section from the coil skeleton to the welding point, so the first part A is not stripped. The first part A can be the first circle of enameled wire or half a circle of enameled wire wrapped around the pin 12. After the enameled wire of the second part B is stripped and fixed to the pin 12 by soldering or other methods, on the one hand, electrical connection with the pin 12 is achieved, and on the other hand, soldering can strengthen the strength of the connection position to prevent the enameled wire from falling off due to vibration during use. The enameled wire is no longer wound above the second part B, and the pin replaces the original upper enameled wire, so that the lead-out length of the enameled wire is shortened and the risk of the wire being torn off is reduced.

[0055] Since the radial dimension of the welding area will increase, the distance from the solenoid valve body will decrease, and the probability of poor insulation during vibration will increase. Therefore, an insulating member needs to be provided on the periphery of this area. The insulating member can be a heat shrink tube, or an injection molded member 19 can be formed on the periphery of the soldering area D by injection molding, so that the injection molded member serves as an insulating member.

[0056] The upper side of the pin, that is, the area not connected to the enameled wire, also needs to be provided with an insulating member to prevent the pin from contacting the electromagnet or valve body radially outside the coil and causing a short circuit. Figure 2 As shown, a heat shrink tube 18 can be placed around the pin to prevent accidental touch.

[0057] When in use, insert the pin into the reserved socket on the frame, and wind the enameled wire around the cylindrical surface. To prevent the wire tail from loosening, apply high temperature resistant glue at the last turn of the winding to fix the wire tail. After winding, lead the enameled wire out of the notch of the edge plate and wind it around the pin.

[0058] After the paint is stripped off the ends and tails of the enameled wire, they are welded and fixed to the pins to achieve electrical connection. In addition, in order to ensure that the strength of the enameled wire in a vibration environment is not reduced after welding, it is necessary to control the length of the paint stripping at the head and tail of the enameled wire, so that the first part of the enameled wire head and the pin is not stripped and welded, until the second part is stripped and soldered, to ensure that the stripped sections of the enameled wire are all wrapped around the pins and wrapped with solder during subsequent welding. In order to prevent poor insulation caused by contact between the coil and the metal shell, the enameled wire including the soldering point is injection molded to form an injection molded part for coating. Continue to put heat shrink tubing on the pin to prevent the pin from contacting the electromagnet and causing a short circuit.

[0059] The tail end of the pin 12 is directly led out through a small hole on the valve body and is electrically connected to a wiring terminal on the solenoid valve body.

[0060] like Figure 1 and 2 As shown, the solenoid valve further includes an electrical interface 41 located on the outer surface of the valve body 4, and the electrical interface 41 is, for example, a wire outlet hole or a plug. The tail end of the pin 12 is electrically connected to a wire 42 through a terminal 43 such as a jack, and the wire 42 passes through the electrical interface on the injector body and is connected to a power source to supply power to the solenoid coil.

[0061] The position of the plug hole on the edge plate is determined by the circumferential position of the electrical interface 41 on the valve body 4, and then the position of the plug pin 12 is determined. The circumferential position of the plug hole is roughly consistent with the circumferential position of the electrical interface, or the circumferential position of the plug hole is close to the circumferential position of the electrical interface 41 to adapt to the specific angle of the line and avoid line breakage. Figure 2 The circumferential angle a of the two electrical interfaces 41 shown is about 70°, and the circumferential positions of the two pins 12 are about 70° apart.

[0062] Preferably, the boss 16 is circumferentially movably arranged on the edge plate 13, for example, a circular groove is arranged on the edge plate, the boss is movable in the circular groove, and a plurality of notches 14 are arranged on the edge plate. When the outlet structure is adapted to the electronically controlled fuel injector, the circumferential position of the boss can be adjusted to a region substantially consistent with the circumferential position of the electrical interface on the fuel injector to adapt to a specific angle of the wiring.

[0063] The above-mentioned outlet structure has the following effects:

[0064] (1) A notch and a pin adjacent to the notch are provided on the edge plate to facilitate the enameled wire to be led out from the cylindrical surface after being wound, thereby preventing the enameled wire from being torn off due to interference from the edge plate, and allowing the pin to replace a portion of the enameled wire to be led out, thereby reducing the area where the wire breaks;

[0065] (2) The circumferential position of the pin is determined by the circumferential position of the electrical interface on the injector, so that the wiring direction can adapt to the position of the electrical interface on the injector, thereby reducing the risk of disconnection;

[0066] (3) For the front part of the winding pin, the first part of the enameled wire is reserved without stripping the paint, and then welded and fixed at the second part. This ensures the connection strength while avoiding the section of the coil from being torn off, further reducing the risk of wire breakage.

[0067] In combination with the introduction to the above-mentioned wire-level wire diameter multi-turn coil output structure, it is also possible to understand an electronically controlled fuel injector including the output structure.

[0068] It should be noted that the above content uses words such as "first" and "second" to limit components, which is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0069] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0070] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0071] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0072] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. Wire-level multi-turn coil output structure, characterized in that: include: The coil frame provides a cylindrical surface for winding the enameled wire, and also includes an edge plate located at the end of the cylindrical surface, the edge plate is provided with a notch and a plug hole, and the notch is used to lead out the enameled wire; and The plug pin cooperates with the plug hole and is used for winding the enameled wire led out from the notch and is electrically connected to the enameled wire.

2. The outlet structure according to claim 1, characterized in that: The edge plate is provided with a boss, and the insertion hole is arranged on the boss.

3. The outlet structure according to claim 1, characterized in that: The insertion hole and the notch are arranged adjacent to each other.

4. The outlet structure according to claim 1, characterized in that: The enameled wire wound around the plug pin includes a first part and a second part, the first part and the second part are respectively away from the edge plate, the enameled wire of the second part is welded and fixed to the plug pin after paint stripping, and the first part is not stripped.

5. The outlet structure according to claim 4, characterized in that: The structure also includes an insulating member located at the first portion, the second portion and the periphery of the pin.

6. The outlet structure according to claim 5, characterized in that: The insulating parts around the first part and the second part are injection molded parts.

7. The outlet structure according to claim 5, characterized in that: The insulating member is a heat shrink tube.

8. The outlet structure according to claim 4, characterized in that: The first part is a first circle of enameled wire wound around the pin.

9. The outlet structure according to claim 2, characterized in that: The boss is circumferentially movably disposed on the edge plate, and the edge plate further includes a plurality of notches.

10. An electronically controlled fuel injector, comprising a valve body, wherein the valve body is provided with an electrical interface, characterized in that: It also includes a wire-level wire diameter multi-turn coil output structure as described in any one of claims 1-9, and the circumferential position of the jack of the output structure is close to the circumferential position of the electrical interface, or is consistent with the circumferential position of the electrical interface.

11. The electronically controlled fuel injector according to claim 10, characterized in that: The valve body is also provided with a wiring terminal for electrically connecting with the plug pin.

Images