Positioning pin structure of fuel injection pump

Abstract

The invention discloses a fuel injection pump positioning pin structure, and belongs to the technical field of engines and diesel engines, the fuel injection pump positioning pin structure comprises a driving shaft, the conical surface of the driving shaft is provided with a conical pin hole, the bottom end of the conical pin hole is slidably connected with a fixed base, and the top end of the fixed base is slidably connected with a conical column; the top end of the conical column is rotationally connected with a hollow column, and a top cover is installed at the top end of the hollow column. A woodruff key is changed into a rolled spring, a solid structure of the woodruff key is changed into a hollow structure, when the positioning pin is assembled, the rolled spring deforms, a pin hole does not deform, and stress of the pin hole is greatly reduced, meanwhile, a pressing and locking structure is arranged in the fixed base, and when the conical surface of a driving shaft is pressed and attached, the locking structure is pressed, and the locking structure is locked. Therefore, the fitting force of the conical surface is improved, the high-precision fitting of the conical surface is ensured, the influence of the positioning pin on the precision of the conical surface is eliminated, and the product reliability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel supply systems, and in particular relates to a positioning pin structure for a fuel injection pump. Background Art

[0002] The fuel injection pump is an important part of the automobile diesel engine. The fuel injection pump assembly is usually composed of the fuel injection pump, speed governor and other components installed together to form a whole. The speed governor is a component that ensures the low-speed operation of the diesel engine and limits the maximum speed, ensuring that the injection volume and speed maintain a certain relationship. The fuel injection pump is the most important component of the diesel engine and is regarded as the "heart" of the diesel engine. The fuel injection pump relies on the drive shaft to connect the gear train through the cone surface to provide power source, compress the plunger, and turn the low-pressure oil into high-pressure oil. The positioning pin design on the drive shaft reduces the force on the gear train, reduces the noise of the fuel injection pump, and improves product reliability.

[0003] At present, the upper positioning pin structure of the drive shaft cone surface is a semicircular key structure, which has an interference fit with the pin hole on the drive shaft. The drive shaft transmits power by pressing and fitting the cone surface, which requires very high precision. When assembling the semicircular key, due to the interference fit and the solid structure of the semicircular key, the cone surface is deformed, the cone surface precision is reduced after assembly, and even the fitting area is reduced, affecting the product function. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art and provide a fuel injection pump locating pin structure.

[0005] The technical solution adopted to solve the above technical problems is: a fuel injection pump locating pin structure, including a drive shaft, a tapered pin hole is arranged on the conical surface of the drive shaft, the bottom end of the tapered pin hole is slidably connected to a fixed base, the top end of the fixed base is slidably connected to a tapered column, the top end of the tapered column is rotatably connected to a hollow column, and a top cover is installed on the top end of the hollow column.

[0006] Furthermore, the fixed base is a cylindrical concave structure, and a groove is provided on the outer side of the fixed base, and the grooves are arranged in a circular array. A pressure column is slidably connected through the bottom end of the inner side of the fixed base, and the top of the pressure column is recessed, and the recessed end of the pressure column is engaged with the conical end of the conical column. A plurality of L-shaped plates are provided on the cylindrical surface of the pressure column, and the L-shaped plates are arranged in a circular array.

[0007] Through the above technical solution, the fixed base is moved by the downward pressure of the pressure column, thereby driving the locking structure to achieve a close fit between the tapered pin hole and the drive shaft, further improving the fitting strength of the tapered surface, ensuring high-precision fitting of the tapered surface, and reducing deformation of the tapered surface, thereby improving the reliability of the injection pump and reducing noise.

[0008] Furthermore, a square clamp is slidably connected to the middle of the L-shaped plate, and one end of the square clamp close to the fixed base is rotatably connected to a rotating seat, the rotating seat is fixedly connected to the fixed base, and one end of the square clamp away from the rotating seat is slidably connected to the slot, and one end of the square clamp located inside the slot is fixedly connected to a rubber head.

[0009] Through the above technical solution, when the pressure column is pressed down and moved, since one end of the square clamping plate is installed inside the fixed base through the rotating seat, the middle part of the L-shaped plate presses down the square clamping plate, so that the other end of the square clamping plate rotates and extends out of the slot to contact the surface of the tapered pin hole. The arranged rubber head fits tightly with the surface of the tapered pin hole, thereby achieving a more precise match between the tapered pin hole and the drive shaft. The elastic characteristics of the rubber head can absorb part of the vibration, further reduce noise, and improve the stability and service life of the injection pump.

[0010] Furthermore, the L-shaped plate is fixedly connected to a trapezoidal push block at one end away from the pressure column, and a top block is slidably connected to one side of the trapezoidal push block, and a curved clamping plate is fixedly connected to the end of the top block away from the trapezoidal push block, and the curved clamping plate is slidably connected to the inner surface of the fixed base, and the curved clamping plate is installed with sliding columns fixedly connected to both sides of one end of the top block, and the sliding column is slidably connected to the fixed base, and one end of the sliding column located inside the fixed base is fixedly connected to a limiting plate.

[0011] Through the above technical solution, when the pressure column moves downward, the trapezoidal push block cooperates with the top block to push the four curved clamps inward and apply uniform pressure to the surface of the tapered column to ensure the tight fit between the tapered column and the tapered pin hole. The curved design of the curved clamp makes the applied pressure more uniform, avoiding local stress concentration, thereby improving the stability and reliability of the overall structure. The coordinated use of the sliding column and the limit plate ensures the positioning accuracy of the curved clamp during the sliding process and prevents structural damage caused by excessive pressure.

[0012] Furthermore, the top end of the conical column is slidably fitted with the bottom end of the hollow column, the top end of the conical column is rotatably connected with a rotating shaft, the through end of the rotating shaft is fixedly connected with a cross slide, the inner wall of the hollow column is fixedly connected with a plurality of sliding grooves, the sliding grooves are arranged in a circular array, and the sliding grooves are meshed and slidably engaged with the cross slide.

[0013] Through the above technical solution, the conical column can rotate freely with the hollow column through the rotating shaft and the cross slide. The circular array arrangement of the slide groove can ensure the stable positioning of the cross slide in the slide groove, further improving the flexibility and accuracy of the locating pin structure.

[0014] Furthermore, a card slot is fixedly connected to the top of the slide slot, a fixed plate is provided inside the card slot, the top of the fixed plate is fixedly connected to the inner side of the top cover, a coil spring is provided at the bottom of the top cover, and the bottom of the coil spring is rotatably connected to the cross slide.

[0015] Through the above technical solution, the existence of the coil spring provides a certain elastic support for the cross slide, so that it can maintain a certain resilience when subjected to external force, thereby ensuring the stability and reliability of the injection pump locating pin structure during operation.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The present invention changes the semicircular key into a scroll spring and the solid structure of the semicircular key into a hollow structure, so that when the locating pin is assembled, the scroll spring pin is deformed, but the pin hole is not deformed, the force on the pin hole is greatly reduced, the influence of the locating pin on the cone surface accuracy is eliminated, and the product reliability is improved.

[0018] 2. The present invention arranges a press-locking structure inside the fixed base. When the conical surface of the drive shaft is pressed and fitted, the locking structure is pressed to ensure a close fit between the conical pin hole and the locating pin, thereby increasing the fitting strength of the conical surface, ensuring high-precision fitting of the conical surface, reducing deformation of the conical surface, and thus improving the reliability of the fuel injection pump and reducing noise.

[0019] 3. The present invention provides a slot on the outside of the fixed base and installs a rubber head with elastic properties in the slot, so that the tapered pin hole and the drive shaft can be matched more accurately. At the same time, the elastic property of the rubber head can absorb part of the vibration, further reduce noise, and improve the stability and service life of the fuel injection pump.

[0020] 4. The present invention ensures the close fit between the tapered column and the tapered pin hole by adopting a combination of a trapezoidal push block and a curved clamping plate. The curved surface design of the curved clamping plate makes the applied pressure more uniform, avoiding local stress concentration, thereby improving the stability and reliability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic cross-sectional view of a drive shaft of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the fuel injection pump positioning pin of the present invention;

[0023] Figure 3 is a first cross-sectional schematic diagram of a fixed base of the present invention;

[0024] Figure 4 is a second cross-sectional schematic diagram of the fixed base of the present invention;

[0025] Figure 5 is a third cross-sectional schematic diagram of the fixed base of the present invention;

[0026] Figure 6 It is a schematic diagram of the conical column structure of the present invention;

[0027] Figure 7 is a cross-sectional schematic diagram of a hollow column of the present invention;

[0028] Figure 8 It is a top view schematic diagram of a hollow column of the present invention.

[0029] Figure numerals: 1. driving shaft; 2. tapered pin hole; 3. fixed base; 4. tapered column; 5. hollow column; 6. top cover; 7. pressure column; 8. L-shaped plate; 9. square clamping plate; 10. rotating seat; 11. slot; 12. rubber head; 13. trapezoidal push block; 14. top block; 15. curved clamping plate; 16. limit plate; 17. sliding column; 18. rotating shaft; 19. cross slide plate; 20. slide groove; 21. clamping groove; 22. fixed plate; 23. coil spring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] like Figures 1 to 8 As shown, a fuel injection pump locating pin structure of the present embodiment includes a driving shaft 1, a conical pin hole 2 is arranged on the conical surface of the driving shaft 1, the bottom end of the conical pin hole 2 is slidably connected to a fixed base 3, the top end of the fixed base 3 is slidably connected to a conical column 4, the top end of the conical column 4 is rotatably connected to a hollow column 5, and a top cover 6 is installed on the top end of the hollow column 5. The semicircular key is changed into a coil spring 23, and the solid structure of the semicircular key is changed into a hollow structure, so that when the locating pin is assembled, the coil spring 23 is deformed, the pin hole is not deformed, and the force on the pin hole is greatly reduced.

[0032] The fixed base 3 is a cylindrical concave structure, and a groove 11 is provided on the outer side of the fixed base 3, and the grooves 11 are arranged in a circular array. A pressure column 7 is slidably connected through the bottom end of the inner side of the fixed base 3, and the top of the pressure column 7 is recessed. The recessed end of the pressure column 7 is engaged with the conical end of the conical column 4. A plurality of L-shaped plates 8 are provided on the cylindrical surface of the pressure column 7, and the L-shaped plates 8 are arranged in a circular array. The fixed base 3 is pressed down and moved by the pressure column 7, thereby driving the locking structure to achieve a close fit between the conical pin hole 2 and the drive shaft 1, and further improve the fitting strength of the conical surface.

[0033] A square clamping plate 9 is slidably connected to the middle part of the L-shaped plate 8, and a rotating seat 10 is rotatably connected to one end of the square clamping plate 9 close to the fixed base 3. The rotating seat 10 is fixedly connected to the fixed base 3, and the end of the square clamping plate 9 away from the rotating seat 10 is slidably connected to the slot 11. A rubber head 12 is fixedly connected to one end of the square clamping plate 9 located inside the slot 11. The rubber head 12 is tightly fitted to the surface of the tapered pin hole 2, so as to achieve a more precise fit between the tapered pin hole 2 and the drive shaft 1. The elastic characteristics of the rubber head 12 can absorb part of the vibration, further reduce noise, and improve the stability and service life of the injection pump.

[0034] The L-shaped plate 8 is fixedly connected to a trapezoidal push block 13 at one end away from the pressure column 7, and a top block 14 is slidably connected to one side of the trapezoidal push block 13. The top block 14 is fixedly connected to a curved card plate 15 at one end away from the trapezoidal push block 13. The curved card plate 15 is slidably connected to the inner surface of the fixed base 3 through the cooperation of the trapezoidal push block 13 and the top block 14, thereby pushing the four curved card plates 15 to move inward and evenly pressurize the surface of the tapered column 4 to ensure the tight fit between the tapered column 4 and the tapered pin hole 2. The curved card plate 15 is installed with sliding columns 17 fixedly connected to both sides of one end of the top block 14. The sliding column 17 is slidably connected to the fixed base 3. The end of the sliding column 17 located inside the fixed base 3 is fixedly connected to a limiting plate 16. The cooperation of the sliding column 17 and the limiting plate 16 ensures the positioning accuracy of the curved card plate 15 during the sliding process and prevents structural damage caused by excessive pressure.

[0035] The top end of the conical column 4 is slidably fitted with the bottom end of the hollow column 5. A rotating shaft 18 is passed through the top end of the conical column 4 and is rotatably connected. A cross slide 19 is fixedly connected to the through end of the rotating shaft 18. The conical column 4 and the hollow column 5 can rotate freely through the rotating shaft 18 and the cross slide 19. A plurality of slide grooves 20 are fixedly connected to the inner wall of the hollow column 5. The slide grooves 20 are arranged in a circular array. The slide grooves 20 are meshed and slid with the cross slide 19, which can ensure the stable positioning of the cross slide 19 in the slide groove 20, further improving the flexibility and accuracy of the locating pin structure.

[0036] A slot 21 is fixedly connected to the top of the slide groove 20, a fixing plate 22 is arranged inside the slot 21, the top of the fixing plate 22 is fixedly connected to the inner side of the top cover 6, a coil spring 23 is arranged at the bottom end of the top cover 6, and the bottom end of the coil spring 23 is rotatably connected to the cross slide 19. The existence of the coil spring 23 provides a certain elastic support for the cross slide 19, so that it can maintain a certain resilience when subjected to external force, thereby ensuring the stability and reliability of the injection pump locating pin structure during operation.

[0037] The working principle of this embodiment is as follows:

[0038] During operation, the drive shaft 1 closely cooperates with the tapered column 4 through the tapered pin hole 2 to achieve precise fit of the tapered surface. The tapered column 4 is connected to the cross slide 19 through the rotating shaft 18, and the cross slide 19 slides in the slide groove 20, ensuring the flexibility and accuracy of the positioning pin structure. When the drive shaft 1 rotates, the pressure between the tapered pin hole 2 and the tapered column 4 is transmitted to the L-shaped plate 8 through the pressure column 7, so that the L-shaped plate 8 slides in the slot 11. The sliding connection between the square card plate 9 and the L-shaped plate 8 enables it to be adjusted accordingly according to the shape of the tapered surface of the tapered pin hole 2, thereby ensuring the close fit between the tapered pin hole 2 and the tapered column 4. The rubber head 12 is located at one end inside the slot 11, which can absorb part of the vibration, reduce noise, and improve the stability and service life of the fuel injection pump. At the same time, the elastic properties of the rubber head 12 can also ensure that the tapered pin hole 2 and the drive shaft 1 fit more accurately. The combination of the trapezoidal push block 13 and the curved clamping plate 15 ensures a tight fit between the tapered column 4 and the tapered pin hole 2. The curved design of the curved clamping plate 15 makes the applied pressure more uniform, avoiding local stress concentration, thereby improving the stability and reliability of the overall structure. The presence of the coil spring 23 provides a certain elastic support for the cross slide 19, so that it can maintain a certain resilience when subjected to external force, thereby ensuring the stability and reliability of the fuel injection pump locating pin structure during operation. The present invention not only improves the performance of the fuel injection pump, but also reduces noise, prolongs service life, and has significant practical value.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A fuel injection pump locating pin structure, comprising a drive shaft (1), characterized in that: The conical surface of the driving shaft (1) is provided with a conical pin hole (2), the bottom end of the conical pin hole (2) is slidably connected to a fixed base (3), the top end of the fixed base (3) is slidably connected to a conical column (4), the top end of the conical column (4) is rotatably connected to a hollow column (5), and a top cover (6) is installed on the top end of the hollow column (5).

2. A fuel injection pump locating pin structure according to claim 1, characterized in that: The fixed base (3) is a cylindrical concave structure, and a groove (11) is arranged on the outer side of the fixed base (3), and the groove (11) is arranged in a circular array. A pressure column (7) is slidably connected through the bottom end of the inner side of the fixed base (3), and the top of the pressure column (7) is concave, and the concave end of the pressure column (7) is engaged with the conical end of the conical column (4). A plurality of L-shaped plates (8) are arranged on the cylindrical surface of the pressure column (7), and the L-shaped plates (8) are arranged in a circular array.

3. A fuel injection pump locating pin structure according to claim 2, characterized in that: A square clamp (9) is slidably connected to the middle of the L-shaped plate (8); one end of the square clamp (9) close to the fixed base (3) is rotatably connected to a rotating seat (10); the rotating seat (10) is fixedly connected to the fixed base (3); one end of the square clamp (9) away from the rotating seat (10) is slidably connected to the slot (11); and one end of the square clamp (9) located inside the slot (11) is fixedly connected to a rubber head (12).

4. A fuel injection pump locating pin structure according to claim 2, characterized in that: The end of the L-shaped plate (8) away from the pressure column (7) is fixedly connected to a trapezoidal push block (13), one side of the trapezoidal push block (13) is slidably connected to a top block (14), the end of the top block (14) away from the trapezoidal push block (13) is fixedly connected to a curved surface clamping plate (15), the curved surface clamping plate (15) is slidably connected to the inner surface of the fixed base (3), the curved surface clamping plate (15) is fixedly connected to sliding columns (17) on both sides of one end of the curved surface clamping plate (15) on which the top block (14) is installed, the sliding columns (17) are slidably connected to the fixed base (3), and one end of the sliding column (17) located inside the fixed base (3) is fixedly connected to a limiting plate (16).

5. The fuel injection pump positioning pin structure according to claim 1, characterized in that: The top end of the conical column (4) is slidably fitted with the bottom end of the hollow column (5); a rotating shaft (18) is rotatably connected to the top end of the conical column (4); a cross slide (19) is fixedly connected to the through end of the rotating shaft (18); a plurality of slide grooves (20) are fixedly connected to the inner wall of the hollow column (5); the slide grooves (20) are arranged in a circular array; the slide grooves (20) are meshed and slidably engaged with the cross slide (19).

6. The fuel injection pump positioning pin structure according to claim 5, characterized in that: The top end of the slide groove (20) is fixedly connected with a clamping groove (21), the inner side of the clamping groove (21) is provided with a fixing plate (22), the top end of the fixing plate (22) is fixedly connected with the inner side of the top cover (6), the bottom end of the top cover (6) is provided with a coil spring (23), and the bottom end of the coil spring (23) is rotatably connected with the cross slide plate (19).

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