Fuel injection pump with correction assembly

Abstract

A fuel injection pump with a correction assembly comprises a pump body, a cam shaft is installed in the pump body, a shaft neck is machined on the cam shaft, an installation hole is machined in the side face of the shaft neck, an inner groove is machined in an orifice outside the installation hole, a correction seat is arranged in the inner groove, an adjusting hole is machined in the middle of the correction seat, and an adjusting screw is connected into the adjusting hole. A telescopic head is in threaded connection with the front end of the adjusting screw, a telescopic sleeve is connected to an orifice in the mounting hole, a telescopic hole is machined in the middle of the telescopic sleeve, the telescopic head is arranged in the telescopic hole, a key block is arranged between the telescopic head and the telescopic hole, a positioning groove is machined in the side face of the journal, and a telescopic positioning head is connected to the front end of the telescopic head. The positioning head is clamped into the positioning groove, the tail of the adjusting screw sinks into the adjusting hole, and a rubber plug is installed at an orifice of the adjusting hole to block the adjusting screw. The correction assembly is of a hidden structure, the surface of the pump body is simpler, and misoperation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of fuel injection pump technology, specifically to a fuel injection pump with a calibration component. Background Technology

[0002] The fuel injection pump operates by rotating an internal camshaft, which in turn drives a plunger to inject fuel. However, during camshaft installation, the angle between the cam and the plunger cannot be determined. Improper assembly can lead to insufficient fuel injection or white smoke. To address this issue, a correction structure is added to the pump body. For example, Chinese patent CN217976432U, entitled "A Marine Fuel Injection Pump with Correction Function," features a correction seat on the side of the pump body. The correction seat has a mounting hole in the center, and a correction pin is installed inside the mounting hole. A spring is installed on the outside of the correction pin, and the spring force holds one end of the correction pin into a slot. A support seat is machined on the other end of the correction pin, with its outer ring protruding from the correction seat. A support ring is connected to the outside of the correction seat, and one side of the support ring pushes up the support seat. This protruding correction seat is prone to interference with other components and can easily lead to misoperation of the support ring. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a fuel injection pump with a correction component, which addresses the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A fuel injection pump with a calibration component includes a pump body, a camshaft mounted inside the pump body, a journal machined on the camshaft, a mounting hole machined on the side of the journal on the pump body, an inner groove machined at the opening of the mounting hole, a calibration seat disposed in the inner groove, an adjustment hole machined in the middle of the calibration seat, an adjustment screw connected to the adjustment hole, a threaded connection hole machined at the front end of the adjustment screw, a telescopic head connected to the threaded connection hole, a telescopic sleeve connected to the opening inside the mounting hole, a telescopic hole machined in the middle of the telescopic sleeve, a telescopic head disposed in the telescopic hole, a key block disposed between the telescopic head and the telescopic hole, a positioning groove machined on the side of the journal, a telescopic positioning head connected to the front end of the telescopic head, the positioning head engaging in the positioning groove, the tail of the adjustment screw sinking into the adjustment hole, and a rubber stopper installed at the opening of the adjustment hole to block the adjustment screw.

[0006] Furthermore, the calibration seat uses two mounting plates, which are mounted on the pump body around their perimeter by countersunk screws. The adjusting screw has an outer flange at its tail, which is engaged between the two mounting plates.

[0007] Furthermore, the two mounting plates are provided with leveling pads around their perimeters, and the thickness of the leveling pads is the same as the thickness of the outer flange.

[0008] Furthermore, the telescopic head has a key block mounting groove machined on its side, and the key block is embedded in the mounting groove. The telescopic hole in the middle of the telescopic sleeve has a key block sliding groove machined on its side, and the key block slides in the key block sliding groove.

[0009] Furthermore, the front end of the telescopic head is machined with a positioning hole, the positioning head is set in the positioning hole, and a spring is provided between the positioning head and the positioning hole.

[0010] Furthermore, the tail of the adjusting screw is machined with a slotted groove or a cross groove.

[0011] Compared with the prior art, the present invention provides a fuel injection pump with a correction component. The correction component adopts a hidden structure, making the pump body surface simpler and avoiding misoperation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0014] Among them, 1. Pump body, 2. Camshaft, 3. Journal, 4. Correction seat, 5. Adjusting screw, 6. Telescopic head, 7. Telescopic sleeve, 8. Key block, 9. Positioning head, 10. Tightening groove, 11. Rubber plug, 12. Equal height pad, 13. Outer flange, 14. Spring. Detailed Implementation

[0015] The technical solutions in the embodiments of this utility model will be clearly and completely described below.

[0016] like Figure 1 and Figure 2As shown, a fuel injection pump with a calibration assembly includes a pump body 1, a camshaft 2 installed inside the pump body 1, a journal 3 machined on the camshaft 2, a mounting hole machined on the side of the journal 3 on the pump body 1, an inner groove machined at the outer opening of the mounting hole, a calibration seat 4 disposed within the inner groove, an adjustment hole machined in the middle of the calibration seat 4, an adjustment screw 5 connected to the adjustment hole, a threaded connection hole machined at the front end of the adjustment screw 5, a telescopic head 6 threadedly connected to the threaded connection hole, and a connection at the inner opening of the mounting hole. The device includes a telescopic sleeve 7 with a telescopic hole machined in the middle. A telescopic head 6 is placed inside the telescopic hole, and a key block 8 is provided between the telescopic head and the telescopic hole. A positioning groove is machined on the side of the journal 3. A telescopic positioning head 9 is connected to the front end of the telescopic head 6 and is inserted into the positioning groove. The tail of the adjusting screw 5 is recessed into the adjusting hole, and a turning groove 10 is machined on the tail of the adjusting screw 5. A rubber plug 11 is installed at the opening of the adjusting hole to block the adjusting screw 5 and hide it.

[0017] In this embodiment, the calibration seat 4 uses two mounting plates. The mounting plates are mounted on the pump body 1 with countersunk screws around their periphery. Equalizing pads 12 are provided around the periphery of the two mounting plates. The countersunk screws pass through the equalizing pads 12. The adjusting screw 5 is connected to the adjusting hole in the middle of the two mounting plates. An outer flange 13 is provided at the tail of the adjusting screw 5. The thickness of the equalizing pad 12 is the same as the thickness of the outer flange 13. The equalizing pad 12 spreads the two mounting plates apart so that the outer flange 13 is locked between the two mounting plates. The telescopic head 6 has a key block mounting groove machined on its side. The key block 8 is embedded in the mounting groove. The telescopic hole in the middle of the telescopic sleeve has a key block sliding groove machined on its side. The key block 8 slides in the key block sliding groove. The front end of the telescopic head 6 has a positioning hole machined. The positioning head 9 is set in the positioning hole. The positioning head 9 is made of steel ball. A spring 14 is provided between the steel ball and the positioning hole to hold the steel ball in place.

[0018] The screw groove 10 is a straight groove or a cross groove. When assembling the fuel injection pump, screw the adjusting screw 5 to make the telescopic head 6 extend along the telescopic sleeve. Rotate the camshaft to make the positioning head 9 snap into the positioning groove to fix the camshaft. After the assembly is completed, screw the adjusting screw 5 again to make the telescopic head 6 retract along the telescopic sleeve until the camshaft moves smoothly. Then cover it with the rubber plug 11 to hide the adjusting screw 5.

[0019] This utility model is not limited to the embodiments described. Those skilled in the art can still make some modifications or changes without departing from the spirit and scope of this utility model. Therefore, the scope of protection of this utility model shall be determined by the scope defined in the claims.

Claims

1. An injection pump with a correction assembly, comprising a pump body, a camshaft is installed in the pump body, a journal is machined on the camshaft, characterized in that: The journal has mounting holes machined on the pump body. An inner groove is machined at the opening of the mounting hole, and a calibration seat is installed within the inner groove. An adjustment hole is machined in the center of the calibration seat, and an adjustment screw is connected to the adjustment hole. A threaded connection hole is machined at the front end of the adjustment screw, and a telescopic head is connected to the threaded connection hole. A telescopic sleeve is connected to the opening inside the mounting hole, and a telescopic hole is machined in the center of the telescopic sleeve. The telescopic head is positioned within the telescopic hole, and a key is provided between the telescopic head and the telescopic hole. A positioning groove is machined on the side of the journal, and a retractable positioning head is connected to the front end of the telescopic head. The positioning head engages with the positioning groove. The tail of the adjustment screw sinks into the adjustment hole, and a rubber plug is installed at the opening of the adjustment hole to block the adjustment screw.

2. An injection pump with a correction assembly according to claim 1, characterized in that The calibration seat uses two mounting plates, which are mounted on the pump body around the perimeter by countersunk screws. The adjusting screw has an outer flange at its tail, which is engaged between the two mounting plates.

3. An injection pump with a correction assembly according to claim 2, characterized in that: The two mounting plates are surrounded by leveling pads, the thickness of which is the same as the thickness of the outer flange.

4. An injection pump having a correction assembly as set forth in claim 1, characterized in that: The telescopic head has a key block mounting groove machined on its side, and the key block is embedded in the mounting groove. The telescopic hole in the middle of the telescopic sleeve has a key block sliding groove machined on its side, and the key block slides in the key block sliding groove.

5. An injection pump having a correction assembly as set forth in claim 1, characterized in that: The telescopic head has a positioning hole machined at its front end, the positioning head is set in the positioning hole, and a spring is set between the positioning head and the positioning hole.

6. An injection pump having a correction assembly as set forth in claim 1, characterized in that: The tail of the adjusting screw is machined with a slot or a cross slot.

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