CN108757251B

CN108757251B - Fuel injector

Info

Publication number: CN108757251B
Application number: CN201810455555.3A
Authority: CN
Inventors: 肖广飞; 孙文仲; 贾毓鼎; 邵一凯; 尹歆
Original assignee: Ningbo Saichi Power Technology Co ltd
Current assignee: Ningbo Saichi Power Technology Co ltd
Priority date: 2018-03-07
Filing date: 2018-05-14
Publication date: 2023-09-22
Anticipated expiration: 2038-05-14
Also published as: CN108757251A

Abstract

The application relates to the technical field of automobile parts, in particular to an oil sprayer, which comprises a valve body (1), a valve cover (3), a valve core part (5) and a driving assembly for driving the valve core part (5) to act; the fuel injector further comprises an adjusting screw (9), wherein the adjusting screw (9) is in threaded connection with the valve cover (3), and the adjusting screw (9) is provided with a flow port (10) for enabling oil to flow into the valve core component (5); and one end of the spring (11) is abutted against the valve core component (5), and the other end of the spring (11) is abutted against the adjusting screw (9). The application provides the fuel injector with adjustable response time, so that the fuel injector can be better adapted to specific working conditions for adjustment.

Description

Fuel injector

Technical Field

The application relates to the technical field of automobile parts, in particular to an oil sprayer.

Background

The fuel injector is mainly used for changing quantitative fuel oil from liquid state into mist state and then mixing the mist with air, so that one of common parts in the field of automobiles is realized.

Prior art fuel injectors typically employ electromagnetic effects to control their opening and closing. The swirl type electric fuel injector (application publication No. CN 101806265A) for gasoline engine disclosed in the national intellectual property agency is composed of: the valve seat is formed by sequentially connecting an end cover, an iron core, a reset spring, an armature, a valve rod, a valve core and a valve seat in the axial direction, and further comprises a coil framework, a coil, a shell, a guide sleeve and a spray hole, wherein the coil framework and the coil are arranged on the periphery of the iron core, the shell is arranged on the periphery of the coil, and the guide sleeve is in movable fit with the valve core. The fuel injector disclosed in this patent has the following disadvantages:

1. the distance between the iron core and the armature, namely the stroke, is fixed, and the elastic force of the reset spring is fixed, so that the response time of the fuel injector cannot be adjusted after the fuel injector is assembled, and the fuel injector cannot be adjusted to adapt to specific working conditions.

2. The wiring mode of the fuel injector is that the fuel enters from the upper end of the fuel injector, so that the assembly above the fuel injector can be influenced; and the power connection mode is complex, and the power is not good.

3. The spray hole of the oil sprayer is only one through hole, so that the atomization effect of the oil sprayer needs to be improved.

Disclosure of Invention

The present application aims to solve one of the above technical problems.

The application aims to solve the technical problem of providing the fuel injector with adjustable response time, so that the fuel injector can be better adapted to specific working conditions for adjustment.

To solve the technical problems, the fuel injector of the application comprises

The oil spraying port is formed in one end of the valve body;

the valve cover is fixedly connected with the valve body, the inner side of the valve cover is provided with a circular ring column extending towards the direction of the oil injection port,

the valve core component is connected in the valve body in a sliding way, a space is reserved between the valve core component and the circular ring column in a normal state, and one end of the valve core component is abutted against the oil injection port and seals the oil injection port;

the driving assembly is used for driving the valve core component to act; the driving assembly comprises a coil component for magnetizing the circular column when the driving assembly is electrified and a wiring component for electrifying the coil component, the coil component is fixed on the outer circumferential surface of the circular column, the wiring component is fixedly connected with the coil component, and when the circular column is magnetized, the valve core component moves towards the circular column;

the fuel injector further comprises

The adjusting screw is in threaded connection with the valve cover and is provided with a flow port for enabling oil to flow into the valve core component;

and one end of the spring is abutted against the valve core component, and the other end of the spring is abutted against the adjusting screw.

After adopting above-mentioned structure, have following advantage: on the one hand, the adjusting screw can be adjusted according to the actual working condition demands, so that the requirements of specific working conditions are met. On the other hand, different preset range values of the power-on response time can be formulated according to different requirements of customers, and products with different power-on response times can be obtained by adjusting the adjusting screw, so that the diversified requirements of the products are met. That is, products with different power-on response time can be obtained by adopting the same structure by only adjusting the adjusting screw, so that the production cost is saved, and the adjustment is convenient.

The valve body is provided with an axial extension part at one end of the oil injection port, the end part of the axial extension part is provided with an outward-expanding oil outlet, the oil outlet is communicated with the oil injection port, the top of the valve core part is fixedly connected with a throttle block, the throttle block is positioned at the position of the oil outlet, and the distance H between the throttle block and the oil outlet in the axial direction is larger than the interval. The distance H between the throttle block and the oil outlet in the axial direction is 1.3 to 5 times of the interval. For example: the distance H is 1.3 times or 2 times or 3 times or 5 times the spacing.

The top fixedly connected with throttle piece means that the top of case part is equipped with the mounting groove, throttle piece and mounting groove interference fit are connected.

The oil outlet is provided with an inner side surface, one end, which is far inwards, of the inner side surface is a first convex cambered surface, one end, which is far outwards, of the inner side surface is a first concave cambered surface, and the first convex cambered surface is connected with the first concave cambered surface in a tangential manner; one side of the throttling block facing the inner side surface is an outer side surface, one end, which is far inwards, of the outer side surface is a second concave cambered surface, one end, which is far outwards, of the outer side surface is a second convex cambered surface, and the second convex cambered surface is connected with the second concave cambered surface in a tangent mode. Therefore, during oil injection, the inner side surface and the outer side surface are matched to form rolling oil mist, so that the fuel performance is improved.

The valve core component comprises a valve core and a columnar armature seat with an inner hole, a limit ring is arranged on the peripheral surface of the inner hole in a protruding mode, and the spring limit ring is abutted; the limiting ring and the inner hole form a clamping groove, the end part of the valve core is connected with the clamping groove in an interference fit mode, a valve core installation cavity and an armature seat installation cavity are formed in the valve body, the valve core is slidably connected in the valve core installation cavity, and the armature seat is slidably connected in the armature seat installation cavity.

The outer peripheral surface of the valve core is provided with a sinking step surface, and the sinking step surface and the side surface of the valve core mounting cavity form an oil passing channel.

The coil component comprises a coil and a coil framework with a winding groove, and the coil is fixed in the winding groove; the coil framework is sleeved on the circular column, two lead grooves are arranged on one side, far away from the oil spraying port, of the coil framework in parallel, the coil is provided with two leads, and the two leads are respectively positioned in the two lead grooves; the wiring component comprises a base and two wiring terminals, an inserting port is formed in the side face of the base, the base is sleeved with the top end of the coil framework, the two wiring terminals are fixed on the base, one ends of the wiring terminals are connected with the lead wires, and the other ends of the wiring terminals are located in the inserting port. The base is sleeved with the top end of the coil framework, the base and the coil framework can be conveniently assembled, and the plug-in port is positioned on the side face of the base, so that power can be supplied to the wiring of the fuel injector from the side face, and the problem that the fuel injector is inconvenient to assemble with other installation components due to the wiring of the top end of the fuel injector in the prior art is avoided.

The base is sleeved with the top end of the coil framework, the top end of the coil framework is provided with a circular ring-shaped installation part, the base is provided with an inner ring hole which is matched with the circular ring-shaped installation part, the inner ring hole is sleeved with the circular ring-shaped installation part, and the two lead grooves are positioned on the circular ring-shaped installation part. Therefore, when the assembly is carried out, the inner ring hole is sleeved on the annular mounting part, so that the assembly is completed, and the assembly is convenient.

The length of one end of the wiring terminal far away from the plug interface is greater than the height in the axial direction of the annular mounting part, when the inner ring hole is sleeved on the annular mounting part, one end of the wiring terminal far away from the plug interface is bent into the lead groove under the offset effect of the end face of the lead groove, and the wiring terminal is welded with the lead. After combining this kind of structure, because the length that one end that the interface was kept away from to binding post is greater than the ascending height of ring shape installation department axis, and binding post part is located the inner circle hole like this, when the assembly, because binding post's size is less and plastic deformation, when the in-process that inner circle hole and ring shape installation department cup jointed, binding post kept away from the interface one end can automatic bending to the lead wire inslot under the offset effect of lead wire groove terminal surface, has removed the manual work and has broken it with the fingers and thumb, has improved assembly efficiency.

The lead wire groove is including the lead wire groove first portion and the lead wire groove second portion that communicate together, the width of lead wire groove first portion is greater than lead wire groove second portion, the outside of lead wire groove second portion is located to lead wire groove first portion, and the width that the terminal kept away from the tip of interface is greater than the width of lead wire groove second portion but is less than the width of lead wire groove first portion. When such a structure is not adopted, there is a possibility that the following problems may occur: during assembly, the inner ring hole and the annular mounting part are in sleeve joint, and move relatively, and the wiring terminal can collide with the lead after plastic deformation to enable the lead to slide to the bottom end of the lead groove, so that welding is affected. Or require a person to pull the lead during assembly, thereby affecting assembly efficiency. After the structure is adopted, the lead is positioned in the second part of the lead groove, and when the lead is assembled, the wiring terminal cannot be abutted to the second part of the lead groove, so that the wiring terminal cannot be abutted to the lead after plastic deformation, and the lead is not affected.

Or, two inside walls of the lead groove are oppositely provided with limiting protrusions, the limiting protrusions form a clamping opening, the lead is located at the inner end of the clamping opening, and the width of the end part of the wiring terminal, which is far away from the plug-in opening, is larger than the width of the clamping opening but smaller than the width of the lead groove. After the structure is adopted, the lead is positioned at the inner end of the clamping opening, and when the lead is assembled, the wiring terminal cannot be abutted to the inner end of the clamping opening, so that the wiring terminal cannot be abutted to the lead after plastic deformation, and the lead is not affected.

The upper end face of the base is provided with two accommodating grooves at corresponding positions of the two lead grooves, the connecting terminals and the end parts of the leads are accommodated in the accommodating grooves, and glue is poured into the accommodating grooves and the lead grooves. Therefore, the accommodating groove can leave space for welding work of the wiring terminal and the lead on one hand, and is convenient for a welding process; on the other hand, the end parts of the wiring terminal and the lead are accommodated in the accommodating groove, so that the external influence can be avoided, the occupation of the end parts of the wiring terminal and the lead to the assembly is avoided, and the positions of the elements are reasonably arranged.

A positioning structure is arranged between the base and the annular mounting part; the positioning structure comprises a limiting groove arranged on the annular mounting part and a limiting block arranged on the base, and the limiting block is clamped with the limiting groove. Of course, the positions of the limiting block and the limiting groove can be interchanged. Therefore, when the inner ring hole is assembled with the annular mounting part, the positioning can be accurately performed, so that one end of the wiring terminal, which is far away from the plug-in port, is just bent into the wiring groove under the abutting action of the end face of the wiring groove, and the assembly is convenient. In addition, when the oil sprayer is used, the positioning structure can ensure that the base and the annular installation part are relatively stable, and the working stability is ensured.

A first liquid sealing structure is arranged between the coil framework and the valve body; the first liquid sealing structure comprises a first annular groove arranged in the valve body and a first sealing ring clamped in the first annular groove.

A second liquid sealing structure is arranged between the coil framework and the circular ring column; the second liquid sealing structure comprises a second annular groove arranged at the inner end of the coil framework and a second sealing ring clamped in the second annular groove.

A third liquid sealing structure is arranged between the adjusting screw and the circular column; the third liquid sealing structure comprises a third annular groove arranged on the outer peripheral surface of the adjusting screw and a third sealing ring clamped in the third annular groove.

The valve cover is fixedly connected with the valve body, the end part of the valve body is provided with a limiting flange which is arranged outwards, the valve cover is provided with a bent flange which is formed by bending at the position of the limiting flange, and the flange is clamped with the limiting flange. In this way, the plastic molding mode has the advantages of stable structure and low cost.

Drawings

FIG. 1 is a schematic diagram of a fuel injector according to the present application.

FIG. 2 is a split schematic of the fuel injector of the present application.

FIG. 3 is a schematic cross-sectional view of a fuel injector of the present application.

Fig. 4 is an enlarged schematic view at a in fig. 3.

Fig. 5 is a schematic structural view of the injector of the present application during the process of sleeving the inner ring hole with the annular mounting portion.

Fig. 6 is an enlarged schematic view at B in fig. 5.

Fig. 7 is a schematic view of the structure of the connecting terminal and the end of the lead wire of the fuel injector of the present application when they are accommodated in the accommodation groove.

Fig. 8 is a schematic view of the structure of the coil and bobbin of the fuel injector of the present application assembled together.

Fig. 9 is an enlarged schematic view at C in fig. 8.

FIG. 10 is a schematic view of a fuel injector of the present application having a spacing bump.

Fig. 11 is a schematic view of the structure of the wiring member in the fuel injector of the present application.

FIG. 12 is a flow chart of a method of assembling a fuel injector of the present application.

Wherein:

1. a valve body; 2. an oil spraying port; 3. a valve cover; 4. a circular column; 5. a valve core component; 6. spacing; 7. a coil member; 8. a wiring member; 9. an adjusting screw; 10. a flow port; 11. a spring; 12. an axial extension; 13. an oil outlet; 14. a throttle block; 15. a mounting groove; 16. an inner side surface; 17. a first convex cambered surface; 18. a first concave cambered surface; 19. an outer side surface; 20. a second concave cambered surface; 21. the second convex cambered surface; 22. a valve core; 23. an inner bore; 24. an armature seat; 25. a limit ring; 26. a clamping groove; 27. a valve core mounting cavity; 28. an armature seat mounting cavity; 29. sinking the step surface; 30. an oil passage; 31. a coil; 32. a wire winding groove; 33. a coil bobbin; 34. a wire slot; 35. a lead wire; 36. a base; 37. a connection terminal; 38. an interface; 39. a circular ring-shaped mounting part; 40. an inner ring hole; 41. a first portion of the wiring groove; 42. a second portion of the wiring groove; 43. a limit protrusion; 44. a clamping opening; 45. a receiving groove; 46. a limit groove; 47. a limiting block; 48. a first annular groove; 49. a first seal ring; 50. a second annular groove; 51. a second seal ring; 52. a third annular groove; 53. a third seal ring; 54. a limit flange; 55. and (5) flanging.

Detailed Description

The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the substance of their work to others skilled in the art. These inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of their inclusion to those skilled in the art. It should also be noted that these embodiments are not mutually exclusive. A component, step or element from one embodiment may be conceived that may be present or utilized in another embodiment. The particular embodiments shown and described may be replaced with a wide variety of alternative and/or equivalent implementations without departing from the scope of the embodiments of the present disclosure. This disclosure is intended to cover any adaptations or variations of the embodiments discussed herein. It will be apparent to those skilled in the art that alternative embodiments may be practiced using only some of the described aspects. Specific numbers, materials, and configurations are described herein in the embodiments for purposes of illustration, however, alternative embodiments may be practiced by one skilled in the art without these specific details. In other instances, well-known features may be omitted or simplified in order not to obscure the illustrative embodiments.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "provided with," "mounted to," "connected to," and "connected to" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two elements; the term "fixed" may be a bolted and/or screwed connection and/or a snap-fit and/or weld, the specific meaning of the term in the present application being understood in a specific way to a person skilled in the art.

1-11, in one embodiment, a fuel injector includes

The valve comprises a valve body 1, wherein an oil injection port 2 is arranged at one end of the valve body 1;

the valve cover 3 is fixedly connected with the valve body 1, the inner side of the valve cover 3 is provided with a circular ring column 4 extending towards the direction of the oil injection port 2,

the valve core component 5 is slidably connected in the valve body 1, a space 6 is formed between the valve core component 5 and the circular ring column 4 in a normal state, and one end of the valve core component 5 is abutted against the oil injection port 2 and seals the oil injection port 2;

a driving component for driving the valve core component 5 to act; the driving assembly comprises a coil component 7 for magnetizing the circular column 4 when the circular column 4 is electrified and a wiring component 8 for electrifying the coil component 7, the coil component 7 is fixed on the outer circumferential surface of the circular column 4, the wiring component 8 is fixedly connected with the coil component 7, and when the circular column 4 is magnetized, the valve core component 5 moves towards the circular column 4;

the fuel injector further comprises

An adjusting screw 9, the adjusting screw 9 being in threaded connection with the valve cap 3, the adjusting screw 9 having a flow port 10 for letting oil through into the spool part 5;

and a spring 11, wherein one end of the spring 11 is abutted against the valve core component 5, and the other end of the spring 11 is abutted against the adjusting screw 9.

After adopting above-mentioned structure, have following advantage: on the one hand, the adjusting screw 9 can be adjusted according to the actual working condition requirement, so that the requirement of specific working conditions is met. On the other hand, different preset range values of the power-on response time can be formulated according to different requirements of customers, and products with different power-on response times can be obtained by adjusting the adjusting screw 9, so that the diversified requirements of the products are met. That is, products with different power-on response times can be obtained by adopting the same structure by only adjusting the adjusting screw 9, so that the production cost is saved, and the adjustment is convenient.

As shown in fig. 3, the valve body 1 is provided with an axial extension 12 at one end of the oil injection port 2, the end of the axial extension 12 is provided with an outward expansion oil outlet 13, the oil outlet 13 is communicated with the oil injection port 2, the top of the valve core component 5 is fixedly connected with a throttle block 14, the throttle block 14 is positioned at the position of the oil outlet 13, and the distance H between the throttle block 14 and the oil outlet 13 in the axial direction is larger than the interval 6. The distance H in the axial direction between the throttle block 14 and the oil outlet 13 is specifically between 1.3 times and 5 times the interval 6. For example: the distance H is 1.3 times or 2 times or 3 times or 5 times the spacing 6.

The top fixedly connected with the throttle block 14 of case part 5 means, the top of case part 5 is equipped with mounting groove 15, throttle block 14 and mounting groove 15 interference fit are connected.

As shown in fig. 4, the oil outlet 13 has an inner side 16, one end of the inner side 16, which is located inward, is a first convex arc surface 17, one end of the inner side 16, which is located outward, is a first concave arc surface 18, and the first convex arc surface 17 is tangentially connected with the first concave arc surface 18; the side of the throttling block 14 facing the inner side surface 16 is an outer side surface 19, one end of the outer side surface 19, which is far inwards, is a second concave cambered surface 20, one end of the outer side surface 19, which is far outwards, is a second convex cambered surface 21, and the second convex cambered surface 21 is tangentially connected with the second concave cambered surface 20. Thus, during oil injection, the inner side surface 16 and the outer side surface 19 cooperate to form a tumble-like oil mist, thereby improving the fuel performance.

The valve core part 5 comprises a valve core 22 and a columnar armature seat 24 with an inner hole 23, a limit ring 25 is arranged on the peripheral surface of the inner hole 23 in a protruding mode, and the limit ring 25 of the spring 11 is abutted; the limiting ring 25 and the inner hole 23 form a clamping groove 26, the end part of the valve core 22 is connected with the clamping groove 26 in an interference fit mode, a valve core installation cavity 27 and an armature seat installation cavity 28 are arranged on the valve body 1, the valve core 22 is slidably connected in the valve core installation cavity 27, and the armature seat 24 is slidably connected in the armature seat installation cavity 28.

The outer peripheral surface of the valve core 22 is provided with a sinking step surface 29, and the sinking step surface 29 and the side surface of the valve core mounting cavity 27 form an oil passing channel 30.

The coil component 7 comprises a coil 31 and a coil skeleton 33 with a wire slot 32, the coil 31 being fixed in the wire slot 32; the coil framework 33 is sleeved on the circular ring column 4, two lead grooves 34 are arranged on one side, far away from the oil spraying port 2, of the coil framework 33 in parallel, the coil 31 is provided with two leads 35, and the two leads 35 are respectively positioned in the two lead grooves 34; the wiring part 8 comprises a base 36 and two wiring terminals 37, an inserting port 38 is formed in the side face of the base 36, the base 36 is sleeved with the top end of the coil framework 33, the two wiring terminals 37 are fixed on the base 36, one end of each wiring terminal 37 is connected with a lead 35, and the other end of each wiring terminal 37 is located in the inserting port 38. The base 36 is sleeved with the top end of the coil framework 33, the base 36 and the coil framework 33 can be conveniently assembled, and the plug-in port 38 is positioned on the side surface of the base 36, so that power can be supplied to the wiring of the fuel injector from the side surface, and the problem that the fuel injector and other installation components are inconvenient to assemble due to the wiring of the top end of the fuel injector in the prior art is avoided.

The sleeving connection between the base 36 and the top end of the coil frame 33 means that a circular ring-shaped mounting portion 39 is arranged at the top end of the coil frame 33, the base 36 is provided with an inner ring hole 40 corresponding to the circular ring-shaped mounting portion 39, the inner ring hole 40 is sleeved with the circular ring-shaped mounting portion 39, and the two lead grooves 34 are located on the circular ring-shaped mounting portion 39. Thus, when assembling, the inner ring hole 40 is sleeved on the annular mounting part 39, so that the assembly is finished, and the assembly is convenient.

The length of one end of the connecting terminal 37 far away from the inserting port 38 is larger than the height of the annular mounting part 39 in the axial direction, when the inner ring hole 40 is sleeved on the annular mounting part 39, one end of the connecting terminal 37 far away from the inserting port 38 is bent into the lead groove 34 under the abutting action of the end face of the lead groove 34, and the connecting terminal 37 is welded with the lead 35. After the structure is combined, the length of one end of the connecting terminal 37 far away from the inserting port 38 is larger than the height of the annular mounting part 39 in the axial direction, so that the connecting terminal 37 is partially positioned in the inner ring hole 40, and when the connecting terminal 37 is assembled, the connecting terminal 37 can be automatically bent into the lead groove 34 under the abutting action of the end face of the lead groove 34 due to the small size and plastic deformation of the connecting terminal 37, and the assembly efficiency is improved in the sleeving process of the inner ring hole 40 and the annular mounting part 39.

As shown in fig. 9, the lead groove 34 includes a first lead groove portion 41 and a second lead groove portion 42 that are connected together, the first lead groove portion 41 has a greater width than the second lead groove portion 42, the first lead groove portion 41 is located outside the second lead groove portion 42, the lead 35 is located in the second lead groove portion 42, and the terminal 37 has an end distal from the socket 38 with a greater width than the second lead groove portion 42 but less than the first lead groove portion 41. When such a structure is not adopted, there is a possibility that the following problems may occur: during assembly, the inner ring hole 40 and the annular mounting portion 39 are in relative movement in the sleeving process, the connecting terminal 37 may abut against the lead 35 after plastic deformation, so that the lead 35 slides to the bottom end of the lead groove 34, and welding is affected. Or require a person to pull the lead 35 during assembly, thereby affecting assembly efficiency. With this structure, the lead 35 is located in the second portion 42 of the lead groove, and the terminal 37 cannot collide with the second portion 42 of the lead groove during assembly, so that the terminal 37 cannot collide with the lead 35 after plastic deformation, and the lead 35 is not affected.

Alternatively, as shown in fig. 10, two inner side walls of the wire groove 34 are oppositely provided with limiting protrusions 43, the limiting protrusions 43 form a clamping opening 44, the wire 35 is located at an inner end of the clamping opening 44, and a width of an end of the wire terminal 37 away from the inserting opening 38 is larger than a width of the clamping opening 44 but smaller than a width of the wire groove 34. With this structure, the lead 35 is located at the inner end of the holding port 44, and the terminal 37 cannot collide with the inner end of the holding port 44 during assembly, so that the terminal 37 cannot collide with the lead 35 after plastic deformation, and the lead 35 is not affected.

As shown in fig. 7, two accommodating grooves 45 are provided on the upper end surface of the base 36 at positions corresponding to the two lead grooves 34, the terminal 37 and the ends of the leads 35 are accommodated in the accommodating grooves 45, and glue is poured into the accommodating grooves 45 and the lead grooves 34. Thus, the accommodating groove 45 can leave space for welding the wiring terminal 37 and the lead 35, and is convenient for the welding process; on the other hand, the terminal 37 and the end of the lead 35 are accommodated in the accommodating groove 45, so that the terminal 37 and the end of the lead 35 are prevented from being influenced by the outside, the occupied space caused by assembly of the terminal 37 and the end of the lead 35 is avoided, and the positions of the elements are reasonably arranged.

As shown in fig. 5, 7, 8 and 11, a positioning structure is arranged between the base 36 and the annular mounting portion 39; the positioning structure comprises a limiting groove 46 arranged on the annular mounting part 39 and a limiting block 47 arranged on the base 36, and the limiting block 47 is clamped with the limiting groove 46. Of course, the positions of the stopper 47 and the stopper groove 46 may be interchanged. In this way, when the inner ring hole 40 is assembled with the circular ring-shaped mounting part 39, the end of the connecting terminal 37 far away from the inserting port 38 is just bent into the lead groove 34 under the abutting action of the end face of the lead groove 34, so that the assembly is convenient. In addition, the positioning structure can ensure the relative stability of the base 36 and the annular mounting part 39 and ensure the working stability when the fuel injector is used.

A first liquid sealing structure is arranged between the coil framework 33 and the valve body 1; the first liquid sealing structure comprises a first annular groove 48 arranged in the valve body 1 and a first sealing ring 49 clamped in the first annular groove 48.

A second liquid sealing structure is arranged between the coil framework 33 and the circular column 4; the second liquid sealing structure comprises a second annular groove 50 arranged at the inner end of the coil skeleton 33 and a second sealing ring 51 clamped in the second annular groove 50.

A third liquid sealing structure is arranged between the adjusting screw 9 and the circular column 4; the third liquid sealing structure comprises a third annular groove 52 arranged on the outer peripheral surface of the adjusting screw 9 and a third sealing ring 53 clamped in the third annular groove 52.

The valve cover 3 is fixedly connected with the valve body 1, the end part of the valve body 1 is provided with a limiting flange 54 which is arranged outwards, the valve cover 3 is provided with a turned edge 55 which is formed by bending at the position of the limiting flange 54, and the turned edge 55 is clamped with the limiting flange 54. In this way, the plastic molding mode has the advantages of stable structure and low cost.

As shown in fig. 12, the application also discloses an assembling method of the fuel injector, which comprises the following steps:

s1, forming a wiring component 8: injection molding the base 36 and the two terminals 37 to obtain the terminal block 8, wherein the terminals 37 are partially located in the inner ring holes 40;

s2, forming a coil component 7: fixing the coil 31 in the wire groove 32, the two leads 35 of the coil 31 being respectively located in the lead groove second portions 42 of the two lead grooves 34;

s3, forming a driving assembly: the inner ring hole 40 of the base 36 is sleeved on the annular mounting part 39, and one end of the wiring terminal 37 away from the plug-in port 38 can be bent into the lead groove 34 under the abutting action of the end face of the lead groove 34; then the lead 35 and the wiring terminal 37 are bent and placed in the accommodating groove 45 and welded; glue is then poured into the lead grooves 34 and the accommodating grooves 45;

s4, forming a valve core component 5: the armature seat 24 is fixed on the clamp, and the press-fit tool acts on the sinking step surface 29 to connect the end part of the valve core 22 with the clamping groove 26 in an interference fit manner;

s5, assembling the valve core 22 into a valve core mounting cavity 27 of the valve body 1, and then applying a press-fit tool to the end surface of the valve core mounting cavity 27 and connecting the throttle block 14 with the mounting groove 15 in an interference fit manner;

s6, clamping a first sealing ring 49 in the first annular groove 48;

s7, placing the driving assembly in the valve body 1 and sleeving the coil framework 33 in the armature seat 24;

s8, clamping the second sealing ring 51 in the second annular groove 50;

s9, inserting the circular ring column 4 into the coil framework 33 and fixedly connecting the valve cover 3 with the valve body 1;

s10, placing the spring 11 in the circular ring column 4, clamping the third sealing ring 53 in the third annular groove 52, and connecting the adjusting screw 9 with the valve cover 3 in a threaded manner.

After the method is adopted, the method has the following advantages:

1. the two leads 35 are respectively located in the second portions 42 of the lead grooves 34, so that the situation that the connecting terminal 37 may collide with the leads 35 after plastic deformation in the later step to slide the leads 35 to the bottom ends of the lead grooves 34 is avoided, and the later step is well-laid;

2. one end of the wiring terminal 37 far away from the plug-in port 38 can be bent into the lead groove 34 under the offset action of the end face of the lead groove 34 so as to be equivalent to the automatic bending of the wiring terminal 37, thereby being convenient to assemble and improving the assembly efficiency;

3. the press-fitting tool acts on the sinking step surface 29, so that the valve core 22 can be prevented from deforming during assembly due to the fact that the wall thickness of the valve core 22 at the position of the sinking step surface 29 is larger, and the product quality of the fuel injector is guaranteed;

4. the end face of the valve core mounting cavity 27 is acted on by the press-mounting tool, so that the end face of the valve core mounting cavity 27 is not an important end face, and the press-mounting tool is convenient to assemble and does not influence the product quality; the interference fit connection of the throttle block 14 and the mounting groove 15 considers that the throttle block 14 and the valve core 22 cannot be made into an integrated structure, if the throttle block 14 and the valve core 22 are made into an integrated structure, the throttle block cannot be assembled on the valve body 1, the strength of the connection structure can be ensured by the interference fit connection, and the process is convenient;

therefore, the assembling method of the fuel injector provided by the application has the advantages that the steps are buckled, the process is simple and convenient on the basis of ensuring the product quality, namely, a novel assembling method of the fuel injector is generated, and the fuel injector has outstanding substantive characteristics and remarkable progress.

In step S9, the valve cover 3 is fixedly connected with the valve body 1, that is, the edge of the valve cover 3 is bent to form a flange 55 to be clamped on the limit flange 54 of the valve body 1. Thus, the mode of bending and forming the flanging 55 adopts a plastic forming mode, so that the structure is stable and the forming is convenient.

The method for assembling the fuel injector further comprises the following steps:

s11, debugging: testing the energizing response time of the fuel injector, and if the energizing response time obtained by testing is smaller than a preset value range, screwing the adjusting screw 9 outwards; if the power-on response time obtained by the test is larger than the preset value range, screwing the adjusting screw 9 inwards; until the energizing response time obtained by the test meets the preset value range, the screwing of the adjusting screw 9 is stopped. Thus, the product can be well debugged before delivery, and the product is formed. Of course, different preset range values can be formulated according to different requirements of customers, so that products with different parameters can be regulated, and the diversified requirements of the products are met.

s12, after debugging is completed, glue is dripped into the threaded connection position of the adjusting screw 9 and the valve cover 3. Thus, the adjusting screw 9 can be ensured not to loosen and change in position during use, and the use stability of the fuel injector is ensured.

Between step S11 and step S12, further comprising: the flow opening 10 in the adjusting screw 9 is plugged. Thus, the dripping of glue ensures that the glue does not flow into the flow port 10 and affect the interior of the injector.

The foregoing is merely illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the claims, and other corresponding modifications, which would be apparent to those skilled in the art using the technical solutions and concepts of the present application, are intended to fall within the scope of the claims.

Claims

1. An oil injector comprising

The valve comprises a valve body (1), wherein an oil injection port (2) is arranged at one end of the valve body (1);

the valve cover (3) is fixedly connected with the valve body (1), the inner side of the valve cover (3) is provided with a circular column (4) extending towards the direction of the oil injection port (2),

the valve core component (5) is slidably connected in the valve body (1), a space (6) is formed between the valve core component (5) and the circular ring column (4) in a normal state, and one end of the valve core component (5) is abutted against the oil injection port (2) and seals the oil injection port (2);

a driving component for driving the valve core component (5) to act; the driving assembly comprises a coil component (7) for magnetizing the circular column (4) when the driving assembly is electrified and a wiring component (8) for electrifying the coil component (7), the coil component (7) is fixed on the outer circumferential surface of the circular column (4), the wiring component (8) is fixedly connected with the coil component (7), and when the circular column (4) is magnetized, the valve core component (5) moves towards the circular column (4);

characterized in that the fuel injector further comprises

An adjusting screw (9), the adjusting screw (9) being in threaded connection with the valve cap (3), the adjusting screw (9) having a flow port (10) for letting oil through into the valve core part (5);

a spring (11), wherein one end of the spring (11) is abutted against the valve core component (5), and the other end of the spring (11) is abutted against the adjusting screw (9);

the valve body (1) is provided with an axial extension part (12) at one end of the oil injection port (2), the end part of the axial extension part (12) is provided with an outwards-expanding oil outlet (13), the oil outlet (13) is communicated with the oil injection port (2), the top of the valve core part (5) is fixedly connected with a throttling block (14), the throttling block (14) is positioned at the position of the oil outlet (13), and the distance H between the throttling block (14) and the oil outlet (13) in the axial direction is larger than the interval (6); the valve core component (5) comprises a valve core (22) and a columnar armature seat (24) with an inner hole (23), a limit ring (25) is arranged on the peripheral surface of the inner hole (23) in a protruding mode, and the limit ring (25) of the spring (11) is abutted; the limiting ring (25) and the inner hole (23) form a clamping groove (26), the end part of the valve core (22) is connected with the clamping groove (26) in an interference fit mode, a valve core installation cavity (27) and an armature seat installation cavity (28) are arranged on the valve body (1), the valve core (22) is slidably connected in the valve core installation cavity (27), and the armature seat (24) is slidably connected in the armature seat installation cavity (28).

2. A fuel injector according to claim 1, characterized in that the fuel outlet (13) has an inner side (16), a first convex arc surface (17) being at an inner end of the inner side (16), a first concave arc surface (18) being at an outer end of the inner side (16), the first convex arc surface (17) being tangentially connected to the first concave arc surface (18); one side of the throttling block (14) facing the inner side surface (16) is an outer side surface (19), one end, which is far inwards, of the outer side surface (19) is a second concave cambered surface (20), one end, which is far outwards, of the outer side surface (19) is a second convex cambered surface (21), and the second convex cambered surface (21) is tangentially connected with the second concave cambered surface (20).

3. A fuel injector according to claim 1, characterized in that the coil part (7) comprises a coil (31) and a coil former (33) having a wire winding slot (32), the coil (31) being fixed in the wire winding slot (32); the coil framework (33) is sleeved on the circular ring column (4), two lead grooves (34) are arranged on one side, far away from the oil spraying port (2), of the coil framework (33), the coil (31) is provided with two leads (35), and the two leads (35) are respectively positioned in the two lead grooves (34); the wiring component (8) comprises a base (36) and two wiring terminals (37), an inserting port (38) is formed in the side face of the base (36), the base (36) is sleeved with the top end of the coil framework (33), the two wiring terminals (37) are fixed on the base (36), one end of each wiring terminal (37) is connected with a lead wire (35), and the other end of each wiring terminal (37) is located in the inserting port (38).

4. A fuel injector according to claim 3, characterized in that the base (36) is sleeved on the top end of the coil frame (33), the top end of the coil frame (33) is provided with a circular mounting part (39), the base (36) is provided with an inner ring hole (40) corresponding to the circular mounting part (39), the inner ring hole (40) is sleeved on the circular mounting part (39), and the two lead grooves (34) are arranged on the circular mounting part (39).

5. A fuel injector according to claim 4, characterized in that the length of the end of the connection terminal (37) remote from the socket (38) is greater than the height of the annular mounting portion (39) in the axial direction, and when the inner ring hole (40) is fitted over the annular mounting portion (39), the end of the connection terminal (37) remote from the socket (38) is bent into the lead groove (34) by the abutment of the end face of the lead groove (34), and the connection terminal (37) is welded to the lead (35).

6. A fuel injector according to claim 3, characterized in that the lead groove (34) comprises a lead groove first portion (41) and a lead groove second portion (42) which are connected together, the lead groove first portion (41) having a width greater than the lead groove second portion (42), the lead groove first portion (41) being located outside the lead groove second portion (42), the lead (35) being located in the lead groove second portion (42), the terminal (37) having a width at its end remote from the socket (38) greater than the width of the lead groove second portion (42) but less than the width of the lead groove first portion (41).

7. A fuel injector according to claim 3, characterized in that the upper end surface of the base (36) is provided with two accommodating grooves (45) at corresponding positions of the two lead grooves (34), the terminal (37) and the end parts of the leads (35) are accommodated in the accommodating grooves (45), and glue is poured into the accommodating grooves (45) and the lead grooves (34).

8. A fuel injector according to claim 3, characterized in that a positioning structure is provided between the base (36) and the annular mounting portion (39); the positioning structure comprises a limiting groove (46) arranged on the annular mounting part (39) and a limiting block (47) arranged on the base (36), and the limiting block (47) is clamped with the limiting groove (46).