JPH06505073A - Fuel rail with rolling ball fuel injector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Fuel rail technology field with transfer ball type fuel injector The present invention relates to a fuel injector for an internal combustion engine.

Background technology A typical fuel rail of a fuel-injected internal combustion engine has a socket, which are spaced apart along the length of the fuel rail into which the fuel rail is inserted. is included. The fuel injector closes the fuel tank by means of compatible sealing and retention means. It is held in a liquid-tight manner with respect to the roll. A typical fuel injector has a vertically long shape. is normally located on the fuel rail, and the longitudinal dimension of the injector is on the fuel rail. extends transversely to the longitudinal dimension of. As a result of this arrangement, the car's engine The envelope area occupied by the fuel rail assembly within the room is It has an extension determined in the transverse direction by the longitudinal dimension of the fuel injector. Therefore Reducing the extent to which the fuel injector protrudes laterally of the fuel rail extremely effective in reducing the envelope occupied by the aggregates, and This gives vehicle designers a huge advantage in terms of style and packaging. It will be.

Disclosure of invention One of the features of the invention is that the envelope occupied by the fuel rail assembly on the internal combustion engine The new fuel injector profile allows for a significant reduction in surface size. In particular, the fuel injector protrudes laterally of the fuel rail. It is concerned with reducing the extent to which More specifically, the fuel rail It consists of a circular cylindrical walled tube, and the fuel injector is placed almost completely inside the chain tube. As a result, the lateral dimensions of the fuel rail assembly at the location of the fuel injector is approximately equal to the outer diameter of the tube.

The fuel injector is assembled on a support and is assembled into the tube by insertion from the end. It is forming a combination of side jobs that can be found. The fuel injector electrical leads are attached to the support. along the receptacle at one longitudinal end of the completed fuel rail assembly. It extends in the direction. Liquid fuel is injected from the tip of the injector. The end is located in a sealed manner within the hole in the side wall of the tube.

This fuel injector itself is unique. The fuel injector of the present invention is a conventional fuel injector. The solenoid, armature, needle and valve seat run along the length of the fuel injector. The magnetic circuit surrounding the spherical valve member rather than being coaxially arranged have. This ball is attached to the truncated conical valve seat by the spring blade of the cantilever. It is spring-biased toward the more restricted hole closure. surround the ball The magnetic circuit is considered to constitute four sides. armature and solenoid are located on two opposite sides. The stator is U-shaped and its base passes through the solenoid and its legs form the remaining two sides. Electrode The child is a bar of magnetically permeable material whose center point acts on the sphere. So When the lenoid is not energized, the working gap is between the end of the bar and the stator leg. If the solenoid is energized, the magnetic field Lux pulls the bar closer to reduce this working gap. As a result, the bar The ball is forced out of its concentric position with the seat, opening the hole and causing the fuel rail to open. The pressurized liquid fuel supplied to the injector through the inside of the tube is connected to the tip of the injector. It will be possible to pass through for injection. When the solenoid is demagnetized, the cantilever - The spring pushes the ball back into position concentrically with the seat, so that the perforated chain is ejected. to terminate. The fuel injector of the present invention has a very small size for installation within the fuel rail. well-suited to the environment and for efficient and economical use of components and materials. Compatible.

U.S. Pat. A fuel injector is disclosed having an energized ball, the ball actuating the ball. A passage through the valve seat is provided by an electromagnet with a U-shaped stator and an armature bar. It operates so that it can be opened and closed. However, this specification does not describe the invention. A fuel injector as provided with the features of claim 1 is not disclosed.

Further features, advantages and benefits of the invention, together with those already mentioned, can be found in connection with the drawings. The following description and claims may be incorporated into the following description and claims. The drawings are currently in production. The present invention discloses an advantageous embodiment of the invention which is considered to be the best mode for realizing the invention. Ru.

Description of advantageous embodiments 1 to 7 show a fuel rail assembly with several fuel injectors 20 according to the present invention. A body 18 is disclosed.

The fuel injector is placed on a support 22 that fits within a circular cylindrical walled tube 24. and four injectors are provided in this particular example.

For each injector 20, the support 22 has a side wall 28 and a seating wall 30. It has a substantially rectangular well 26. Each injector has a truncated conical shape communicating with the hole 36. It has a sheet member 32 with a sheet 34.

The seat 34 and the hole 36 share a common axis 38 that is perpendicular to the seating wall 30. straight and the wall 30 has a sheet member 32 fitted therein in the manner described above. It has a hole of a suitable shape that allows it to.

A ball 40 is located on the sheet 34 and all figures show that the ball can close the hole 36. It is shown concentric with axis 38 as shown in FIG. The ball is a flat spring brake. When the door 42 lies upward, it becomes concentric and is biased in a resilient manner. The spring blade 42 is attached to a vertical boss on the wall 30 near the seat member 32. It is assembled to the port 44 in a cantilever shape. In all drawings, the blade 42 is It is shown substantially parallel to the wall 30. Cantilevering of the blade onto the post - type assembly is achieved by a hole in the blade, with a hole inserted through the chain hole. The interference fit bottle of the striker has passed and the head portion 46 of the bottle is located within the blade. Overlap the perimeter of the hole and secure the corresponding end of the blade to the top of the post It is held in Additionally, the post 44 may have a hole at its top and may also have a screw thread. The shank of the screw can pass through the hole in the blade and the screw The screw seals the hole in the post and the screw head moves the blade into the head of the post. It is configured so that it can be held in the door section. In the drawing, the blade is flat and the wall 3 Although shown as approximately parallel to 0, if the sphere were coaxial to the axis then the spring This applies a preload to the ball. This preload is applied to the head of the post and and the head of the ball is set relatively high in a special form, or by a combination of This can be formed by an adapted shape of the blade.

The injector surrounds the ball 40 and includes a solenoid coil 48, a stator 50 and contacts. It has a magnetic circuit made up of poles 52. As seen in Figure 3, the magnetic The air circuit is generally a rectangular shape with four sides for installation within the well 26. It is considered to have a shape. The coil 48 and the armature 52 are two facing each other. , while the remaining two sides facing each other form part of the stator 50. Therefore, it is formed.

The coil 48 is arranged within the well 26 with its axis parallel to the placement wall 30. are located apart from the axis 38. The wall 30 has a hole for receiving the coil 48. have. The stator 5o is generally U-shaped and passes through the coil 48. a main body 54 extending from the main body 54 to form two opposing sides of the magnetic circuit; The zero leg 56.58 consists of two parallel legs 56,58. It has a vent section provided for transitioning from the bell to the level of the ball 4o. Contact The pole 52 has a bar shape and is arranged along the side of the sphere 4o! being magnetic circuit approximately the center of the bar which is actuated by and is designated by the numeral 60. It is acting on the ball at the point. The sheet member 32 is used to prevent the armature from acting on the sphere. It has a notch 61 of a shape suitable for the. The solenoid coil is not energized. In the condition shown in the drawing, the opposite ends of the bar have generally equal working gaps. The center point of the armature is at a distance from the end of the legs 56, 58 at 62, 64. , six solenoid coils in contact with the ball at the special radial end of the ball are energized. Then, the magnetic flux generated in the magnetic circuit moves the armature 52 to the stator leg 56, 58 to reduce the working gap by drawing it towards the end. Operate. This causes the armature 52 to move in the direction of an imaginary line intersecting the axis 38. The imaginary line, viewed along the axis 38, causes its own dominant movement. The radius of the sphere corresponds approximately to the radius of the sphere, and its ends are brought into contact by the center point of the armature. being admired. The elasticity of the armature 52, the spring blade 42, and the angle of the seat 34 Due to the cooperative effect of the motion of Movement to the centric position results in opening of hole 36. Ball 40 is actually Then, it rolls slightly above the seat 34 in the direction of the post 44. So When the excitation of the lenoid coil is finished, the stator 50 The traction force disappears and the elastic force of the spring blades thereby causes the ball to align with the axis 38. The hole 36 is then returned to its original position, resulting in a closure of the hole 36.

The holes 36 are provided by a fuel injector tip or nozzle 68 that injects fuel into the engine. I'm surrounded.

An O-ring seal 70 is located in a groove extending around the sidewall of the spray tip.

An electrical lead 72 from the injector is disposed within a groove 72 in the support 22 and is shown in FIG. 5, it is connected to a connector 76 near the end of the support 22. So The lenoid coil, stator and seat members are secured to the support by suitable fastening means. are fixed within the wells and each has an inlet for each fuel injector. , a cover 78 with an adaptable window to capture the leads in the groove on the support. is attached to. The cover is designed to enclose certain components of the fuel injector. a projection 79 (FIG. 2); The extent to which the spring blade 42 defining the armature 52 is bent away from the sheet member 32 It helps limit the amount.

The support, injector and cover combination is inserted through one end of the tube. By doing so, a combination of side dishes that can be collected in the tube 24 is formed.

As can be clearly seen in FIG. It has an envelope surface. This auxiliary coalescence occurs when the injector tip 68 penetrates the wall of the tube. It is inserted into the tube in such a way that it can be aligned with the corresponding circular hole 82 in the tube. Next Then, the side dish unit is deflected in the radial direction, and its tip passes through the hole 82, and its tip part passes through the hole 82. As a result, the O-ring 70 forms a liquid-tight seal between the tip and the hole. Then keep A handle 84 connects the side pipe through the same open end of the tube and generally on the opposite side of the hole 82. Insert into the space 86 (Fig. 7) that exists between the semicircular surface of the pipe wall where it is located. be done. The retainer 84 is provided with a resilient attachment of the type shown between the side assembly and the pipe wall. It is illustrated as a rectangular metal elongate member having a predetermined elasticity for the parts.

The bend of the retainer 84 is oriented against the inside of the wall of the tube 24 on the opposite diameter of the hole 82. 7, and the two sides of the retainer extend from the bend. The combination of side dishes is captured in the locked position.

Pressurized liquid fuel for use is introduced into the tube 24 through a fitted inlet; This allows the fuel injector to be almost completely immersed in fuel. fuel rail has a pressure regulator and returns fuel if the rail is part of a fuel recirculation system. It also has a return outlet for. Inlet fitting, return outlet fitting and pressure regulator are not specifically shown in the drawings and the inlets and/or outlets are not located beyond such ends. A device for closing the pipe end when it is placed on the side outside the pipe. is also not shown. By realizing the principle of the present invention, it is possible to Depending on the characteristics of the engine to which the fuel rail is installed (even its special contours) I will do it. In use connector 76 connects the fuel injector to the normal engine control computer. The injector is used to connect the injector to the Can only operate during positive periods. Energizing the injector solenoid causes the injector to The injection force of the fuel passes through the hole 36 from the inside of the tube and enters the tip of the injector. ) will be injected. The injector fuel metering should cover the outlet of hole 36. A thin orifice disk (not shown) is assembled onto the injector tip in a similar manner. ) 1 will result in t. Injection ends with the end of solenoid excitation.

FIG. 8 depicts another embodiment of the fuel injector. The same code is used. The main difference is that the injector in Figure 8 is a solenoid. The cantilevered shape of the spring blade 42 on the sheet 34 on the opposite side of the coil 48 The point is that the assembly is located in the section. This shortens the magnetic circuit path. compressed, thereby positioning the solenoid coil closer to the seat. The stator leg can be made shorter.

FIG. 9 represents another embodiment of the fuel rail, and similar components are referred to above. The same code is used. FIG. 9 shows an integrated member of an engine manifold 90. A bore 81 for a tube is shown, with a support, a fuel injection A side assembly consisting of a container and a cover is inserted. The retainer 84 is also inserted into the hole 81. In this way, side job combinations are captured at the locations where they are gathered in the same format as in Figure 7.

The materials, surface finishes, hardness, elasticity, etc. of the various parts are subject to acceptable performance and special operations. The choice must be made from the perspective of longevity in the industrial environment. The sheet member 32 is To avoid diverting magnetic flux from the magnetic circuit, compatible stainless steel Made from magnetically non-permeable materials such as Also, certain plastics It is believed that it can be used effectively for certain members.

For example, if the support 22, tube 24 and cover 78 are located in a humid fuel environment, It can be made from a plastic that is inert. Also suitable for fuel All materials used must be naturally inert to the particular fuel component or components being used. There must be. I believe that the ball 40 itself may also be made of compatible plastic. It will be done. 3, which can be advantageously used to form the magnetic circuit of a fuel injector. A special construction for stator 50 is illustrated. The stator is a one-piece part Rather than being a piece of wood, each of them covers the entirety of one stator leg and its base. It is constructed from two separate members, consisting of a portion of the One member is the other member has a threaded hole at the end of its base portion; It has a threaded shank at the end. The two parts have their respective base parts separated. After being inserted into the noid coil, the threaded shank can be screwed into the threaded hole. and are combined by.

The magnetic circuit is advantageous because the working gap is face-to-face with the armature and the end of the stator leg. are constructed such that they cannot be approached close enough to permit complete contact between the two. This thing is , if the ball is deflected from its concentric position with axis 38, the working gap is completely The movement causes the seat member 32 to come into contact with the axial wall 92 (FIG. 8) before being closed. The seat member 32, the ball 40, and the magnetic circuit are designed so that they can be locked by touching the seat member 32, the ball 40, and the magnetic circuit. This can be achieved by

An axial wall 32 extends from the seat 34 parallel to the axis 38 . Also non-magnetic It is also possible to apply a special coating on the ends of the stator and armature.

The armature is designed to deflect relatively little as it operates, so If the equivalent armature consists of a pivot joint assembled at one end, The arrangement is such that the armature can be moved in a small arc. This thing is Furthermore, the result seems to be that a similar effect is exerted on the sphere as well. In other words, exercise , oriented approximately in the direction of the axis along the radius of the sphere contacted by the center of the armature. It is done.

Although a preferred embodiment of the invention has been illustrated and described, the principles of the invention may be understood to be similar to other equivalent embodiments. We hope that you understand that this can also be achieved using other formats.

Brief description of the drawing FIG. 1 represents the general configuration and arrangement of a fuel injector embodying the principles of the present invention. FIG.

FIG. 2 is a side view of the fuel injector of FIG. 1 from one direction.

FIG. 3 is a plan view of FIG. 2.

FIG. 4 is a left-handed side view of FIG. 2.

FIG. 5 is an exploded perspective view of certain portions of a fuel rail assembly embodying the principles of the present invention. FIG. 4 includes a fuel injector similar to FIGS. 1-4.

6 is a detailed cross-sectional view of the fuel rail assembly of FIG. 5 at different scales, 3 represents a special step in the fuel rail assembly fabrication process.

FIG. 7 is a drawing similar to FIG. 6, after completion of the steps depicted by FIG. The state is illustrated.

FIG. 8 is a side view of another embodiment of a fuel injector.

Figure 9 shows an exploded version of the embodiment in which the fuel rail is assembled into the engine manifold. FIG.

international search report international search report EP 9200253 S^　55773

Claims (1)

[Claims] 1. a fuel injector actuated by electrical actuation means (48), the fuel inlet , a main body structure having a fuel outlet and a frustoconical seat (34), and cooperating with said seat. a ball (40) arranged to act, and urging said ball in a resilient manner along an imaginary axis; elastic means (42) acting to actuate the actuator; It consists of a movable bar (52) that can be moved, and the seat (34) is surrounding the orifice (36) and disposed between the fuel inlet and the fuel outlet; and said ball selectively opens and closes said orifice by electrical actuation means. At least the fuel is flowing between the fuel inlet and the fuel outlet, and the virtual Around the axis the frustoconical sheet rotates towards a concentric receptacle on the sheet. In the case of a type that is a rotating surface and closes an orifice by the surface, The movable bar (52) is arranged along the side of the bulb (40) and an imaginary line intersecting said axis. and the bar has a predominant motion along the electrical action direction. said movement towards said axis in response to an electrical control signal transmitted to said movement means; and the front of said bar which is performing said movement away from said axis and towards said axis. The following motion forms a force acting on the sphere at its radial end. and the direction of this force approximately coincides with the imaginary line in the radial direction when viewed along the axis. and the force formed by said movement of said bar along said imaginary line is , in cooperation with the sheet and the elastic means, the ball is moved from a position concentric with the axis to a position concentric with the axis. It is possible to knit by itself to an eccentric position with respect to the axis, and thereby the above-mentioned The orifice becomes open to flow and the said axis moves away from the axis. Said movement of the bar causes said elastic means in cooperation with said seat to move said ball along said axis. to be able to be displaced by itself from an eccentric position with the axis to a concentric position with the axis. and thereby permitting said orifice to A fuel injector characterized in that the fuel injector is closed.