Oil sprayer spring pin fixing structure

Abstract

The utility model discloses a fuel injector spring pin fixing structure which comprises a shell, a mounting cavity is formed in the shell, a connecting rod is arranged in the mounting cavity, the connecting rod is clamped in the mounting cavity, a static iron core is arranged on one side of the connecting rod, a limiting ring is formed on the static iron core, an anchor point is arranged on the limiting ring, and the anchor point is connected with the connecting rod. A groove is formed in the shell, and the groove penetrates through the shell and extends into the groove; the limiting ring is arranged on the static iron core, the anchor point is arranged in the limiting ring, the weak area is formed at the anchor point, and the anchor point is extruded by using a bolt or other riveting parts to drive the static iron core to deform, so that limiting connection of the static iron core is realized, and movement in the shell is avoided; and the stability of connection between the static iron core and the shell is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel injectors, and in particular relates to a spring pin fixing structure of a fuel injector. Background Art

[0002] The injector is a precision device with high processing accuracy, which requires a large dynamic flow range, strong anti-clogging and anti-pollution capabilities, and good atomization performance. The injection amount is controlled by the change of the magnetic attraction between the static iron core and the moving iron core. The injector receives the injection pulse signal sent by the ECU to accurately control the fuel injection amount. The existing connection between the static iron core and the housing is mostly achieved through integral injection molding with the mounting column in the housing. The injection molding production process has high requirements and cannot achieve split production between parts, resulting in reduced production efficiency. The non-integrated injection-molded static iron core has low stability on the housing, resulting in a reduced service life of the injector. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model aims to provide a spring pin fixing structure for a fuel injector.

[0004] The technical solution adopted by the utility model is: it includes a shell, an installation cavity is formed in the shell, a connecting rod is provided in the installation cavity, the connecting rod is clamped in the installation cavity, a static iron core is provided on one side of the connecting rod, a limiting ring is formed on the static iron core, an anchor point is provided on the limiting ring, a groove is provided on the shell, the groove passes through the shell and extends into the groove, a pin is inserted in the groove, an anchoring protrusion is formed at one end of the pin and matches the anchor point, and a moving iron core is connected to one side of the static iron core.

[0005] As a preferred embodiment of the present invention, the top of the static iron core abuts against one end of the connecting rod, at least two anchor points are formed in the limiting ring, and at least two anchor points are distributed in an array along the circumference of the limiting ring.

[0006] As a preferred embodiment of the present invention, when the latch is completely installed in the groove, one end of the latch away from the anchoring protrusion is flush with the circumferential surface of the shell, and the anchor point is cone-shaped or crescent-shaped.

[0007] As a preferred embodiment of the utility model, one end of the moving iron core is connected to the static iron core through a reset spring, and the other end is connected to a valve ball. A driving coil is provided on the circumference of the moving iron core and the static iron core. The driving coil is wound around the circumference of the moving iron core and the static iron core. An electrode sheet is provided on the shell, and the driving coil is electrically connected to the moving iron core and the electrode sheet respectively.

[0008] As a preferred embodiment of the utility model, a valve seat is provided on one side of the valve ball, and the valve seat is fixedly mounted on the bottom of the shell. An oil outlet hole is formed on the valve seat, and the oil outlet hole is connected to the oil channel in the shell and is adapted to the valve ball.

[0009] As a preferred embodiment of the present invention, a metering piece is provided on a side of the bottom of the valve seat away from the valve ball, and the metering piece is installed on the valve seat.

[0010] As a preferred embodiment of the present invention, a filter screen is provided in the connecting rod, and the filter screen is limit-connected to the connecting rod and is located at the top of the connecting rod.

[0011] As a preferred embodiment of the utility model, an oil inlet O-ring is provided at the top end of the shell, and an oil outlet O-ring is provided at the bottom end of the shell, and the oil inlet O-ring and the oil outlet O-ring are respectively sleeved on the shell.

[0012] The beneficial effects of the utility model are:

[0013] The utility model is a spring pin fixing structure for a fuel injector. A limiting ring is arranged on a static iron core, and an anchor point is opened in the limiting ring. A weak area is formed at the anchor point. The anchor point is squeezed by using a latch or other riveted parts to drive the static iron core to deform, thereby achieving a limiting connection for the static iron core, avoiding movement inside a shell, and improving the stability of the connection between the static iron core and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a front view structural schematic diagram of the utility model;

[0017] Figure 3 This utility model Figure 2 A schematic diagram of the cross-sectional structure at AA;

[0018] Figure 4 This utility model Figure 3 A is an enlarged structural diagram of FIG.

[0019] In the figure: 1. Shell; 2. O-ring at the oil inlet end; 3. Connecting rod; 4. Filter; 5. Moving iron core; 6. Stationary iron core; 7. Driving coil; 8. Reset spring; 9. Valve seat; 10. Valve ball; 11. O-ring at the oil outlet end; 12. Electrode sheet; 13. Metering sheet; 14. Groove; 15. Anchor point; 16. Pin; 17. Anchoring bump; 18. Limiting ring; 19. Oil outlet hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] Combine the following Figure 1-4 The specific implementation mode of the utility model is described, and a spring pin fixing structure of a fuel injector is provided, comprising a housing 1, a mounting cavity is formed in the housing 1, and an oil passage is formed inside the mounting cavity while providing a mounting space, a connecting rod 3 is provided in the mounting cavity, and the connecting rod 3 is clamped in the mounting cavity, and a static iron core 6 is provided on one side of the connecting rod 3, and the static iron core 6 provides a magnetic attraction force to make the moving iron core 5 and the static iron core 6 attract or repel each other, so as to drive one side of the moving iron core 5 to control the conduction state of the oil passage, and a limiting ring 18 is formed on the static iron core 6, and the limiting ring 18 is provided on the An anchor point 15 is provided, and a groove 14 is provided on the shell 1. The groove 14 penetrates the shell 1 and extends into the groove 14. A pin 16 is inserted into the groove 14. An anchoring protrusion 17 adapted to the anchor point 15 is formed at one end of the pin 16. A moving iron core 5 is connected to one side of the static iron core 6. An anchor point 15 is formed in a limiting ring 18. The anchor point 15 is knocked and squeezed by a practical pin 16 or other riveted parts to drive the anchor point 15 to deform into the installation cavity, thereby forcing the static iron core 6 to be limitedly installed in the installation cavity.

[0023] Please refer to Figure 3-4 As shown, the top of the static iron core 6 abuts against one end of the connecting rod 3, and the bottom of the static iron core 6 abuts against the connecting rod 3, and the connecting rod 3 is limitedly installed in the installation cavity formed inside the shell 1, and at least two anchor points 15 are formed in the limiting ring 18, and at least two anchor points 15 are distributed in a circular array along the limiting ring 18. By opening the limiting ring 18 on the static iron core 6, a weak point is formed in the static iron core 6, and a deformable anchor point 15 is set at the weak point, so that the anchor point 15 is deformed after being impacted and squeezed, thereby realizing the limited installation of the static iron core 6.

[0024] Please refer to Figure 3-4 As shown, when the latch 16 is fully installed in the groove 14, its end away from the anchoring protrusion 17 is flush with the circumferential surface of the housing 1. After the anchor point 15 is squeezed to a certain position, one end of the latch 16 is flush with the end surface of the housing 1 to prevent contamination or dust from entering the injector. It should be noted that to prevent the latch 16 from moving in the groove 14, the size of one end of the latch 16 can be set to be slightly larger than the size of the groove 14. At the same time, since the injector is plugged into the engine during use, the position of the latch 16 is limited by the plugging. The anchor point 15 is cone-shaped or crescent-shaped. The shape of the anchor point 15 is not particularly limited. In this embodiment, the anchor point 15 is preferably cone-shaped. The force-bearing area of ​​one end of the cone is small, which is convenient for squeezing the anchor point 15 at the limiting ring 18 to deform.

[0025] Please refer to Figure 3 As shown, one end of the moving iron core 5 is connected to the static iron core 6 through a return spring 8, and the other end is connected with a valve ball 10. The circumference of the moving iron core 5 and the static iron core 6 is provided with a driving coil 7, and the driving coil 7 is wound around the circumference of the moving iron core 5 and the static iron core 6. An electrode sheet 12 is provided on the shell 1. The driving coil 7 is electrically connected to the moving iron core 5 and the electrode sheet 12 respectively. The electrode sheet 12 is plugged into the control unit of the engine and controlled by the on-board computer. By controlling the power supply of the electrode sheet 12, the magnetic attraction force of the moving iron core 5 changes, thereby causing the moving iron core 5 and the static iron core 6 to attract or repel each other. Since one end of the moving iron core 5 is connected with the valve ball 10, the valve ball 10 can control the conduction of the oil channel.

[0026] Please refer to Figure 3 As shown, a valve seat 9 is provided on one side of the valve ball 10, and the valve seat 9 is fixedly mounted on the bottom of the housing 1. An oil outlet hole 19 is formed on the valve seat 9, and the oil outlet hole 19 is connected to the oil channel in the housing 1 and is adapted to the valve ball 10. After the valve ball 10 moves upward, the valve ball 10 is separated from the valve seat 9, so that the oil channel is connected to the oil outlet hole 19 on the valve seat 9, thereby realizing the injection of gas into the combustion chamber.

[0027] Please refer to Figure 3 As shown, a metering piece 13 is provided on the side of the bottom of the valve seat 9 away from the valve ball 10 . The metering piece 13 is installed on the valve seat 9 , and the metering piece 13 measures the gas in the oil outlet 19 .

[0028] Please refer to Figure 3 As shown, a filter screen 4 is provided inside the connecting rod 3, and the filter screen 4 is limit-connected to the connecting rod 3 and is located at the top of the connecting rod 3, so that the gas is filtered when entering the shell 1 to prevent impurities from entering the combustion chamber.

[0029] Please refer to Figure 1-4 As shown, the top of the housing 1 is provided with an oil inlet O-ring, and the bottom of the housing 1 is provided with an oil outlet O-ring. The oil inlet O-ring and the oil outlet O-ring are respectively sleeved on the housing 1. The oil inlet O-ring and the oil outlet O-ring are used for limiting when installing the injector, thereby improving the stability of the injector installation.

[0030] Working principle of this utility model:

[0031] The gas enters from the top of the connecting rod 3, is filtered by the filter 4, and enters the oil channel. After the engine receives the oil supply signal, it supplies power to the electromagnetic coil through the electrode sheet 12. The energization of the electromagnetic coil changes the magnetic attraction of the moving iron core 5. By controlling the magnitude of the input current, the moving distance and the motion state of the moving iron core 5 are controlled. Due to the movement of the moving iron core 5, the ball valve connected to the bottom of the moving iron core 5 moves. When the ball valve moves upward, the reset spring 8 is compressed, and the ball valve is separated from the valve seat 9, so that the oil channel is connected to the oil outlet 19, and the gas is sprayed into the cylinder through the metering sheet 13. Combustion is carried out; when it is detected that the oil supply is stopped, no current is passed through the electromagnetic coil, the magnetic attraction of the moving iron core 5 changes, and the elastic force generated by the spring compression cannot be overcome under the mutual repulsion between the static iron core 6 and the moving iron core 5, so that the valve ball 10 moves to the oil outlet 19, blocking the conduction between the oil channel and the valve seat 9. When fixing the static iron core 6, an anchor point 15 is set in the limit ring 18 on the static iron core 6. The anchor point 15 is squeezed by the pin 16 or other riveted parts to cause it to deform, thereby realizing the limited installation of the static iron core 6 and avoiding the movement of the static iron core 6 inside the shell 1.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims of this application, they should all fall within the protection scope of the utility model.

Claims

1. A fuel injector spring pin fixing structure, characterized in that: It includes a shell, an installation cavity is formed in the shell, a connecting rod is provided in the installation cavity, the connecting rod is clamped in the installation cavity, a static iron core is provided on one side of the connecting rod, a limiting ring is formed on the static iron core, an anchor point is provided on the limiting ring, a groove is provided on the shell, the groove passes through the shell and extends into the groove, a pin is inserted in the groove, an anchoring protrusion is formed at one end of the pin and matches the anchor point, and a moving iron core is connected to one side of the static iron core.

2. The fuel injector spring pin fixing structure according to claim 1, characterized in that: The top of the static iron core is in contact with one end of the connecting rod, and at least two anchor points are formed in the limiting ring, and at least two anchor points are distributed in an array along the circumference of the limiting ring.

3. The fuel injector spring pin fixing structure according to claim 2, characterized in that: When the latch is completely installed in the groove, one end of the latch away from the anchoring protrusion is flush with the circumferential surface of the shell, and the anchor point is cone-shaped or crescent-shaped.

4. The fuel injector spring pin fixing structure according to claim 1, characterized in that: One end of the moving iron core is connected to the stationary iron core through a return spring, and the other end is connected to a valve ball. A driving coil is provided on the circumference of the moving iron core and the stationary iron core. The driving coil is wound around the circumference of the moving iron core and the stationary iron core. An electrode sheet is provided on the shell, and the driving coil is electrically connected to the moving iron core and the electrode sheet respectively.

5. The fuel injector spring pin fixing structure according to claim 4, characterized in that: A valve seat is provided on one side of the valve ball, and the valve seat is fixedly mounted on the bottom of the housing. An oil outlet hole is formed on the valve seat, and the oil outlet hole is connected to the oil channel in the housing and is matched with the valve ball.

6. The fuel injector spring pin fixing structure according to claim 5, characterized in that: A metering piece is provided on one side of the bottom of the valve seat away from the valve ball, and the metering piece is installed on the valve seat.

7. The fuel injector spring pin fixing structure according to claim 1, characterized in that: A filter screen is arranged inside the connecting rod, and the filter screen is limit-connected to the connecting rod and is located at the top of the connecting rod.

8. The fuel injector spring pin fixing structure according to claim 7, characterized in that: The top end of the shell is provided with an oil inlet O-ring, and the bottom end of the shell is provided with an oil outlet O-ring. The oil inlet O-ring and the oil outlet O-ring are respectively sleeved on the shell.

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