Fuel injector mounting structure and usage method for a four-valve engine

Abstract

The present invention discloses an injector mounting structure for a four-valve engine, which includes a cylinder head, a cylinder head cover, and an injector. The top surface of the cylinder head is provided with a cylinder head cover and a mounting hole for mounting the injector. The injector includes an assembly end and a wiring end, the assembly end of which is installed in the mounting hole, and the wiring end extends out of the cylinder head. The structure further includes a pressing mechanism, which is installed on the top surface of the cylinder head and includes a locking clip, a pressing bolt, and a balance rod. A perforation is formed in the middle of the locking clip, and the locking clip is rotatably connected to the upper part of the pressing bolt through the perforation. The front end of the locking clip is connected to the injector, and the lower side of the rear end abuts against the top of the balance rod. The lower ends of the pressing bolt and the balance rod are both connected to the top surface of the cylinder head. The lower end of the pressing bolt is threadedly connected to the cylinder head. The cylinder head cover is provided with a relief opening corresponding to the position of the mounting hole. The present invention has the advantages of simple structure and improved efficiency of injector disassembly and assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of engine fuel injectors, and particularly to an installation structure and a usage method of a fuel injector for a four-valve engine. Background Art

[0002] With the continuous improvement of the national emission standards for engines, in order to ensure that the engine meets the emission requirements, traditional mechanical fuel injectors need to be replaced with electronically controlled fuel injectors. Due to design limitations of some engines, the electronically controlled fuel injector is inside the cylinder head cover, which brings inconvenience to the disassembly, assembly and maintenance of the electronically controlled fuel injector.

[0003] For a four-valve engine, the fuel injector is required to be installed in the middle position above the cylinder. The traditional fuel injector layout scheme: the fuel injector is installed inside the cylinder head cover; Disadvantage: It is inconvenient to replace the fuel injector, and the cylinder head cover needs to be removed.

[0004] The existing patent document CN105822452B has improved the assembly problem of the fuel injector, and to a certain extent, improves the disassembly and assembly efficiency of the fuel injector, but the cylinder head cover still needs to be moved when disassembling and assembling the fuel injector. Therefore, the present application researches and develops a new installation structure of the fuel injector to further simplify the disassembly and assembly of the fuel injector and improve the work efficiency.

[0005] The disclosure of the above background art content is only used to assist in understanding the concept and technical solution of the present invention, and it does not necessarily belong to the prior art of this patent application. Without clear evidence that the above content was publicly available on the filing date of this patent application, the above background art should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0006] The purpose of the present invention is to provide an installation structure and a usage method of a fuel injector for a four-valve engine, which have a simple structure and are convenient for disassembly and assembly.

[0007] Therefore, the present invention provides an installation structure and a usage method of a fuel injector for a four-valve engine.

[0008] Preferably, the present invention may further have the following technical features:

[0009] An injector installation structure for a four-valve engine, including a cylinder head, a cylinder head cover, and an injector. The top surface of the cylinder head is provided with a cylinder head cover and an installation hole for installing the injector. The injector includes an assembly end and a wiring end. Its assembly end is installed in the installation hole, and the wiring end extends outside the cylinder head. It also includes a pressing mechanism. The pressing mechanism is installed on the top surface of the cylinder head and includes a lock clip, a pressing bolt, and a balance rod. A through hole is opened in the middle of the lock clip and is rotatably connected to the upper part of the pressing bolt through this through hole. The front end of the lock clip is connected to the injector, and the lower side of the rear end abuts against the top of the balance rod. The lower ends of the pressing bolt and the balance rod are both connected to the top surface of the cylinder head. The lower end of the pressing bolt is threadedly connected to the cylinder head. The cylinder head cover is provided with a relief opening corresponding to the position of the installation hole, so that the wiring end of the injector is exposed outside the coverage of the cylinder head cover.

[0010] Further, the upper end of the balance rod is a hemispherical surface, and the lower end is threadedly connected to the cylinder head.

[0011] Further, the diameter of the through hole is larger than the diameter of the pressing bolt rod and smaller than the outer diameter of the pressing bolt head.

[0012] Further, the lock clip is snap-connected to the injector.

[0013] Further, one end of the lock clip connected to the injector is provided with a U-shaped opening. Flat positions are provided on both sides of the injector to connect the U-shaped opening, and a limiting surface is formed at the lower end of the flat positions.

[0014] Further, the U-shaped opening and the flat positions are in clearance fit.

[0015] Further, the top surface of the cylinder head cover is a stepped surface, and the height of one side of the cylinder head cover provided with the relief opening is lower than that of the other side.

[0016] Further, the relief opening is formed by recessing a certain dimension from one side of the cylinder head cover.

[0017] Further, reinforcing rib plates are provided at the lower end of the cylinder head cover. The reinforcing rib plates form an outward-turning surface, and assembly holes for connecting bolts are opened on the plate surface.

[0018] A method for using an injector installation structure for a four-valve engine. First, connect the balance rod to the top surface of the cylinder head. Then, clamp the U-shaped opening of the lock clip on the flat positions of the injector, and the balance rod supports the rear end of the lock clip. Then, pass the pressing bolt through the through hole of the lock clip and screw it into the screw hole on the top surface of the cylinder head. By tightening the pressing bolt, drive the lock clip to move downward, thereby pressing the injector tightly.

[0019] The beneficial effects of the present invention compared with the prior art include: The pressing mechanism, wire harness interface, etc. are evenly distributed outside the cylinder head cover. The disassembly and assembly of the fuel injector only require adjusting the pressing mechanism, which is convenient and simple, improving work efficiency. The setting of the pressing mechanism can, on the one hand, limit the axial movement of the fuel injector, and on the other hand, also limit the rotation of the fuel injector through the connection of the U-shaped opening and the flat position, with a simple and reliable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a partial perspective view of the present invention.

[0021] Figure 2 is a partial view of the present invention, not including the fuel injector and the pressing mechanism.

[0022] Figure 3 is a partial top view of the present invention.

[0023] Figure 4 is Figure 3 the cross-sectional view taken along C-C in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described in detail below in conjunction with the specific embodiments and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and not intended to limit the scope of the present invention and its applications.

[0025] Referring to the following drawings, non-limiting and non-exclusive embodiments will be described, in which like reference numerals represent like components, unless otherwise specifically stated.

[0026] As Figures 1 to 4 shown, a fuel injector mounting structure for a four-valve engine includes a cylinder head 1, a cylinder head cover 4, and a fuel injector 3. The top surface of the cylinder head 1 is provided with a mounting hole 11 for mounting the fuel injector 3 and the cylinder head cover 4. The fuel injector 3 includes an assembly end and a wiring end, and its assembly end is installed in the mounting hole 11, and the wiring end extends outside the cylinder head 1. The cylinder head cover 4 is provided with a relief opening 43 corresponding to the position of the mounting hole 11, so that the wiring end of the fuel injector 3 is exposed outside the coverage of the cylinder head cover 4. By providing the relief opening 43 in the cylinder head cover 4, when disassembling and assembling the fuel injector 3, there is no interference with the cylinder head cover 4, and thus, the disassembly and assembly of the fuel injector 3 can be completed without removing or moving the cylinder head cover 4, simplifying the work process and improving work efficiency.

[0027] It further includes a pressing mechanism 2, which is installed on the top surface of the cylinder head 1 and includes a locking clip 22, a pressing bolt 23, and a balance rod 21. A perforation 25 is formed in the middle of the locking clip 22, and the locking clip 22 is rotatably connected to the pressing bolt 23 through the perforation 25. The diameter of the perforation 25 is larger than the diameter of the pressing bolt rod and smaller than the outer diameter of the pressing bolt head; the front end of the locking clip 22 is connected to the fuel injector 3, and the lower side of the rear end abuts against the top of the balance rod 21. Among them, the lower ends of the pressing bolt 23 and the balance rod 21 are both threadedly connected to the top surface of the cylinder head 1. Correspondingly, screw holes mating with the pressing bolt 23 and the balance rod 21 are formed in the top surface of the cylinder head 1. Preferably, the upper end of the balance rod 21 is a hemispherical surface.

[0028] Preferably, the locking clip 22 is snap-connected to the fuel injector 3 to improve the disassembly and assembly efficiency. Specifically, a U-shaped opening 24 is provided at one end of the locking clip 22 connected to the fuel injector 3, and flat positions 31 are provided on both sides of the fuel injector 3 to connect to the U-shaped opening 24, and a limiting surface is formed at the lower end of the flat position 31. Preferably, the U-shaped opening 24 and the flat position 31 are in clearance fit. In this way, during installation, first connect the balance rod 21 to the top surface of the cylinder head 1 so that the horizontal height of the upper end of the installed balance rod 21 and the limiting surface of the flat position 31 is basically the same or within a certain drop range; then clamp the U-shaped opening 24 of the locking clip 22 at the flat position 31 of the fuel injector 3, and the rear end of the locking clip 22 abuts against the upper end of the balance rod 21; then pass the pressing bolt 23 through the perforation 25 of the locking clip 22 and screw it into the screw hole on the top surface of the cylinder head 1. By tightening the pressing bolt 23, the locking clip 22 is driven to move downward, so that both sides of the U-shaped opening 24 at the front end of the locking clip 22 press on the limiting surface of the flat position 31, and the rear end is restricted by the balance rod 21 and cannot move downward; continue to tighten the pressing bolt 23 to press down the locking clip 22, and the fuel injector 3 can be pressed in the installation hole 11 by using the locking clip 22 to prevent the fuel injector 3 from loosening or popping out of the fuel injector installation hole 11 and restricting the axial movement of the fuel injector 3. In this embodiment, the pressing mechanism 2 of the fuel injector 3, the wire harness interface, etc. are evenly distributed outside the cylinder head cover 4. The disassembly and assembly of the fuel injector 3 only need to adjust the pressing mechanism 2, which is convenient and simple to disassemble and assemble, and improves the work efficiency. The horizontal height of the upper end of the installed balance rod 21 and the limiting surface of the flat position 31 do not need to be exactly the same, and the purpose of pressing the fuel injector 3 can still be achieved through the swing of the locking clip 22 within a certain drop range, and the assembly flexibility is high.

[0029] Combined with Figure 2, the top surface of the cylinder head cover 4 is a stepped surface, and the height of one side of the cylinder head cover 4 where the relief opening is provided is lower than that of the other side. Under the condition of meeting the assembly requirements, the lower side of the top surface of the cylinder head cover 4 can be depressed as much as possible, and a large chamfer is provided on the lower side of the top surface of the cylinder head cover 4, so as to increase the assembly space of the fuel injector 3. Preferably, the relief opening 43 is formed by recessing a certain dimension from one side of the cylinder head cover 4. After the relief opening 43 is provided on the cylinder head cover 4, the strength of the cylinder head cover 4 is reduced. To improve the strength of the cylinder head cover 43, a reinforcing rib plate 42 is provided along the lower end of the cylinder head cover 43. The reinforcing rib plate 42 forms an outwardly turned surface, and an assembly hole 41 for connecting bolts is provided on the plate surface.

[0030] A usage method of an injector installation structure for a four-valve engine. First, connect the balance bar 21 to the top surface of the cylinder head 1; then, clamp the U-shaped opening 24 of the lock clip 22 on the flat position 31 of the fuel injector 3, and the balance bar 21 supports the rear end of the lock clip 22; then, pass the pressing bolt 23 through the through hole 25 of the lock clip 22 and screw it into the threaded hole on the top surface of the cylinder head 1. By tightening the pressing bolt 23, the lock clip 22 is driven to move downward, thereby pressing the fuel injector 3.

[0031] Those skilled in the art will recognize that numerous variations to the above description are possible, so the embodiments and the accompanying drawings are only used to describe one or more specific embodiments.

[0032] Although the exemplary embodiments that are regarded as the present invention have been described and recited, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Additionally, many modifications can be made to adapt a particular situation to the teachings of the present invention without departing from the central concept described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but the present invention may also include all embodiments within the scope of the present invention and their equivalents.

Claims

1. An injector mounting structure for a four-valve engine, comprising a cylinder head, a cylinder head cover, and an injector. The top surface of the cylinder head is provided with a cylinder head cover and a mounting hole for mounting the injector. The injector includes an assembly end and a wiring end, the assembly end of which is mounted in the mounting hole, and the wiring end extends outside the cylinder head. It is characterized in that: It further includes a pressing mechanism which is installed on the top surface of the cylinder head. The pressing mechanism includes a locking clip, a pressing bolt, and a balance rod. A perforation is formed in the middle of the locking clip, and the locking clip is rotatably connected to the upper part of the pressing bolt through the perforation. The front end of the locking clip is connected to the fuel injector, and the lower side of the rear end abuts against the top of the balance rod. The lower ends of the pressing bolt and the balance rod are both connected to the top surface of the cylinder head. The lower end of the pressing bolt is threadedly connected to the cylinder head. A relief opening corresponding to the position of the mounting hole is formed in the cylinder head cover, so that the wiring terminal of the fuel injector is exposed outside the coverage of the cylinder head cover. The relief opening is formed by recessing a certain dimension from one side of the cylinder head cover. Reinforcing rib plates are arranged at the lower end of the cylinder head cover. The reinforcing rib plates form an outward-turning surface, and assembly holes for connecting bolts are formed on the plate surface.

2. The fuel injector mounting structure of a four-valve engine according to claim 1, characterized in that: The upper end of the balance rod is a hemispherical surface, and the lower end is threadedly connected to the cylinder head.

3. The fuel injector mounting structure of a four-valve engine according to claim 1, characterized in that: The diameter of the perforation is larger than the diameter of the rod of the pressing bolt and smaller than the outer diameter of the head of the pressing bolt.

4. The fuel injector mounting structure of a four-valve engine according to claim 1, characterized in that: The locking clip is snap-connected to the fuel injector.

5. The fuel injector mounting structure of a four-valve engine according to claim 4, characterized in that: One end of the locking clip connected to the fuel injector is provided with a U-shaped opening. Flat positions are arranged on both sides of the fuel injector to connect the U-shaped opening, and a limiting surface is formed at the lower end of the flat position.

6. The fuel injector mounting structure of a four-valve engine according to claim 5, characterized in that: The U-shaped opening and the flat position are in clearance fit.

7. The fuel injector mounting structure of a four-valve engine according to claim 1, characterized in that: The top surface of the cylinder head cover is a stepped surface, and the height of the side of the cylinder head cover where the relief opening is formed is lower than that of the other side.

8. A method of using an injector mounting structure for a four-valve engine as claimed in claim 5, characterized in that: First, connect the balance rod to the top surface of the cylinder head; then, clamp the U-shaped opening of the locking clip on the flat position of the fuel injector, and the balance rod supports the rear end of the locking clip; then, pass the pressing bolt through the perforation of the locking clip and screw it into the screw hole on the top surface of the cylinder head. By tightening the pressing bolt, drive the locking clip to move downward, thereby pressing the fuel injector.

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