CN212389458U

CN212389458U - Roller pin assembly, guide piston and fuel injection pump

Info

Publication number: CN212389458U
Application number: CN202020933859.9U
Authority: CN
Inventors: 扈爽; 周勇; 吕枫; 彭琦; 欧金桃; 田梦江; 罗小华; 熊博熠
Original assignee: Chongqing Hongjiang Machinery Co Ltd
Current assignee: Chongqing Hongjiang Machinery Co Ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2021-01-22
Anticipated expiration: 2030-05-28

Abstract

The utility model discloses a gyro wheel round pin subassembly, guide piston and fuel injection pump, gyro wheel round pin subassembly includes stop pin, reset spring, gyro wheel body, clearance assembly in the interior bush of gyro wheel body and clearance assembly in the interior gyro wheel round pin of bush, is provided with the lubricating oil groove on the outer wall of gyro wheel round pin, it has a plurality of through-holes to distribute on the bush, the through-hole can be with lubricating oil guide-in the lubricating oil groove between the gyro wheel body and the bush; the guide piston comprises a piston body and a roller pin assembly; the oil injection pump comprises an isobaric oil outlet valve component, an oil injection pump body, a plunger matching part, a rack adjusting mechanism, an upper spring plate component, a plunger spring, a lower spring seat, a hard block and a guide piston. The utility model provides a pair of gyro wheel round pin subassembly, guide piston and injection pump can improve the reliability and the life of gyro wheel round pin subassembly, increases structural strength, stability and the life of injection pump, improves the efficiency of injection pump assembly and injection pump installation on the diesel engine.

Description

Roller pin assembly, guide piston and fuel injection pump

Technical Field

The utility model relates to a diesel engine technical field, concretely relates to gyro wheel round pin subassembly, guide piston and injection pump.

Background

As the demand for energy saving and environmental protection has increased, the improvement of diesel engine technology to achieve higher fuel economy and better emission levels has received increasing attention from manufacturers. The ultrahigh pressure of fuel injection is now an inevitable development of fuel injection systems due to its potential advantages in terms of improving economy and emissions. However, in order to achieve the ultrahigh pressure of fuel injection, the pump end pressure must be greatly increased, which increases the contact stress between the roller body and the cam, increases the contact stress between the roller body and the bushing, and between the roller pin and the bushing in the roller pin assembly, and increases the mechanical wear between the roller and the bushing, and between the roller pin and the bushing. The roller pin assembly is one of the main parts of the fuel injection pump, and the working condition of the roller pin assembly directly influences the working condition of the fuel injection pump. In order to ensure the normal operation of the roller pin assembly, the roller pin assembly must have good lubrication, but the conventional roller pin assembly structure cannot meet the increasingly severe working conditions, and a new technology needs to be researched to improve the reliability and the service life of the roller pin assembly so as to meet the use requirement of a highly-reinforced oil injection pump. Meanwhile, the pressure at the pump end is greatly increased, higher requirements are placed on the structural strength and the performance of an oil injection pump, and the existing oil injection pump (such as CN 201620491459) applicable to a four-stroke, exhaust gas turbocharging, intercooling and irreversible diesel engine cannot well meet the development requirements of the diesel engine in the aspects of structural strength, stability, service life and the like, so that a plurality of structures needing further improvement exist.

Disclosure of Invention

In view of this, the utility model aims at overcoming the defect among the prior art, provide a gyro wheel round pin subassembly, guide piston and injection pump, can improve the reliability and the life of gyro wheel round pin subassembly, improve the structure of injection pump, increase the structural strength of injection pump, stability and life, simplify the mounting process of injection pump, assembly process when not only can simplifying the equipment injection pump, assembly efficiency when improving the equipment injection pump, can also simplify the mounting process that the injection pump installed on the diesel engine, improve the assembly efficiency that the injection pump installed on the diesel engine.

The utility model discloses a roller pin assembly, which comprises a stop pin, a reset spring, a roller body, a bushing which is assembled in the roller body in a clearance mode, and a roller pin which is assembled in the bushing in a clearance mode, wherein the left end and the right end of the roller pin are respectively provided with a convex part which protrudes out of the bushing; a lubricating oil groove is formed in the outer wall of the roller pin, a lubricating oil channel is formed in the roller pin, the head end of the lubricating oil channel is communicated with the outside, and the tail end of the lubricating oil channel is communicated with the lubricating oil groove; a plurality of through holes are distributed on the bush, and the through holes can guide the lubricating oil in the lubricating oil groove into the space between the roller body and the bush; the roller pin is characterized in that the protruding portion is provided with an installation hole, the axis of the installation hole is along the radial direction of the roller pin, the reset spring is installed in the installation hole, the head end of the stop pin extends out of the protruding portion, and the tail end of the stop pin is located in the installation hole and connected with the reset spring.

Further, N groups of lubricating oil hole groups are formed by the through holes at intervals along the axial direction of the bushing, and each group of lubricating oil hole groups consists of M through holes arranged at intervals along the circumferential direction of the bushing; p lubricating oil grooves are formed in the roller pin at intervals along the circumferential direction, and the axial length of the P lubricating oil grooves is larger than the axial distance between the left lubricating oil hole group and the right lubricating oil hole group.

Furthermore, the distance between two adjacent groups of lubricating oil hole groups is the same, the distance between two adjacent through holes of each group of lubricating oil hole groups is the same, and the distance between two adjacent lubricating oil grooves is the same; and the lubricating oil hole groups of each group are sequentially staggered by beta degrees from left to right along the same rotating direction.

Furthermore, a positioning adjusting hole is formed in the end face of one side of the roller pin; and a lubricating oil inlet is formed in the protruding part, and the head end of the lubricating oil channel is communicated with the lubricating oil inlet.

The utility model also discloses a guide piston, including the piston main part with as above the gyro wheel round pin subassembly, the bottom of piston main part is provided with and is used for holding the installation space of gyro wheel round pin subassembly, the installation space is including being used for holding the transverse hole of gyro wheel round pin with be used for holding the gyro wheel body reaches the vertical groove of bush, the transverse hole with vertical groove mutually perpendicular and intercommunication, the bottom protrusion in of the gyro wheel body vertical groove, the inside of transverse hole corresponds the position of mounting hole is provided with and is used for holding the locating hole of the head end of stop pin.

The utility model also discloses an injection pump, including isobaric delivery valve subassembly, the injection pump body, plunger matching parts, rack adjustment mechanism, go up spring plate subassembly, plunger spring, lower spring holder and hard piece, the injection pump body is provided with the mesopore along upper and lower direction, isobaric delivery valve subassembly sets up the top of the injection pump body, the plunger matching parts rack adjustment mechanism go up the spring plate subassembly the plunger spring down the spring holder with the hard piece is all installed downthehole, still include as above direction piston, direction piston with the bottom of spring holder is connected down.

Furthermore, a hoisting threaded hole is formed in the isobaric oil outlet valve assembly, a high-pressure fuel outlet hole communicated with the outside is further formed in the isobaric oil outlet valve assembly, and the bottom of the high-pressure fuel outlet hole is a spherical surface.

Furthermore, an inverted 'U' -shaped groove is formed in the bottom of the oil injection pump body, the distance between two side walls of the inverted 'U' -shaped groove increases progressively along the radial direction of the oil injection pump body, first scribed lines are arranged on the two side walls of the inverted 'U' -shaped groove, and second scribed lines are arranged on the guide piston corresponding to the first scribed lines.

Further, the plunger and barrel assembly comprises a plunger sleeve and a plunger rod which is arranged inside the plunger sleeve in a sliding mode; the oil injection pump body is provided with an anti-corrosion screw corresponding to the position of the plunger sleeved in the oil return hole, an anti-corrosion concave surface is arranged at one end, facing the plunger sleeved in the oil return hole, of the anti-corrosion screw, and the anti-corrosion concave surface is sunken towards the direction far away from the plunger sleeved in the oil return hole; the plunger is sleeved in the oil return hole and comprises an oil hole part and an opening part which is positioned at one side of the oil hole part close to the anti-corrosion screw, and the opening direction of the opening part faces to the anti-corrosion concave surface; and a protection boss is arranged at the top of the plunger rod.

The oil injection pump further comprises a first positioning pin and a second positioning pin, wherein the upper end and the lower end of the first positioning pin are respectively connected with the isobaric oil outlet valve assembly and the oil injection pump body, and the upper end and the lower end of the second positioning pin are respectively connected with the isobaric oil outlet valve assembly and the plunger matching part; the bottom of the isobaric oil outlet valve component is provided with a first positioning pin installation groove used for containing the first positioning pin, and the first positioning pin installation groove is communicated with the outside along the radial direction of the oil injection pump body.

The utility model has the advantages that: the utility model discloses a gyro wheel round pin subassembly, guide piston and injection pump, because be provided with a plurality of through-holes on the bush, lubricating oil can fully enter into the clearance of gyro wheel body and bush, through the rotation of gyro wheel body and the unsteady of bush, can form the lubricating oil film of evenly distributed between gyro wheel body and the bush; because the roller pin is provided with the lubricating oil groove and the gap is reserved between the bush and the roller pin, a uniformly distributed lubricating oil film can be formed between the floating bush and the roller pin, the mechanical abrasion between the bush and the roller body and between the bush and the roller pin is effectively improved, the reliability and the service life of the roller pin assembly can be improved, and the reliability and the service life of the guide piston are further improved; through improving the structure of injection pump, increase structural strength, stability and the life of injection pump, assembly process when not only can simplify the equipment injection pump improves the assembly efficiency when assembling the injection pump, can also simplify the mounting process of injection pump installation on the diesel engine, improves the assembly efficiency of injection pump installation on the diesel engine.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic cross-sectional view of an injection pump according to the present invention;

fig. 2 is a schematic structural view of an oil injection pump according to the present invention;

FIG. 3 is a schematic structural diagram of the isobaric oil outlet valve assembly of the present invention;

fig. 4 is a schematic structural diagram of the plunger and barrel assembly of the present invention;

FIG. 5 is a schematic structural view of an upper spring plate assembly according to the present invention;

fig. 6 is a schematic structural view of the guide piston of the present invention;

fig. 7 is a partial structural schematic view of the present invention;

FIG. 8 is a schematic view of the roller pin assembly of the present invention;

fig. 9 is a schematic structural view of the bushing of the present invention;

fig. 10 is a schematic structural view of a roller pin according to the present invention.

Description of the main reference numerals: 1-isobaric oil outlet valve component, 101-oil outlet valve, 102-pressure reducing valve, 103-high-pressure fuel outlet hole, 104-hoisting threaded hole, 105-first positioning pin installation groove, 2-oil injection pump body, 201-corrosion-proof screw, 202-inverted U-shaped groove, 203-first scribed line, 3-plunger matching part, 301-plunger sleeve, 302-plunger rod, 303-protection boss, 304-plunger sleeve oil return hole, 304 a-oil hole part, 304 b-opening part, 4-rack adjusting mechanism, 5-upper spring disc component, 51-upper large cylinder, 52-lower small cylinder, 53-sealing ring, 54-assembly threaded hole, 6-plunger spring, 7-lower spring seat, 8-hard block, 9-guide piston, 901-piston body, 902-second score line, 11-roller pin assembly, 110-stop pin, 111-return spring, 112-roller body, 113-bushing, 113 a-through hole, 114-roller pin, 114 a-lubricating oil groove, 114 b-lubricating oil inlet, 114 c-positioning adjusting hole, 12-air release screw, 13-second positioning pin, 14-air release hole, 15-gasket.

Detailed Description

As shown in fig. 8-10, the roller pin assembly 11 in this embodiment includes a stop pin 110, a return spring 111, a roller body 112, a bushing 113 that is gap-mounted in the roller body 112, and a roller pin 114 that is gap-mounted in the bushing 113, where both left and right ends of the roller pin 114 are provided with protrusions protruding from the bushing 113; a lubricating oil groove 114a is formed in the outer wall of the roller pin 114, a lubricating oil channel is formed in the roller pin 114, the head end of the lubricating oil channel is communicated with the outside, and the tail end of the lubricating oil channel is communicated with the lubricating oil groove 114 a; a plurality of through holes 113a are distributed on the bush 113, and the through holes 113a can guide the lubricating oil in the lubricating oil groove 114a into the space between the roller body 112 and the bush 113; the bulge is provided with an installation hole, the axis of the installation hole is along the radial direction of the roller pin 114, the return spring 111 is installed in the installation hole, the head end of the stop pin 110 extends out of the bulge, and the tail end of the stop pin 110 is located in the installation hole and connected with the return spring 111;

the plurality of through holes 113a form N sets of lubrication hole groups at intervals in the axial direction of the bush 113, each set of lubrication hole groups being composed of M through holes 113a provided at intervals in the circumferential direction of the bush 113; the lubricating oil grooves 114a are arranged at intervals in the circumferential direction of the roller pin 114, and the axial lengths of the lubricating oil grooves 114a are all larger than the axial distance between the left-most lubricating oil hole group and the right-most lubricating oil hole group; the distance between two adjacent groups of the lubricating oil hole groups is the same, the distance between two adjacent through holes 113a of each group of the lubricating oil hole groups is the same, and the distance between two adjacent lubricating oil grooves 114a is the same; the groups of the lubricating oil holes are sequentially staggered by beta degrees from left to right along the same rotating direction, and the preferred value of the beta is 10, 20, 30 or 45; a positioning adjusting hole 114c is formed in one side end face of the roller pin 114; the protruding portion is provided with a lubricant inlet 114b, and the head end of the lubricant passage is communicated with the lubricant inlet 114 b.

In the present embodiment, the number of the through holes 113a is 12, N =3, M =4, P =2, β = 30; each group of lubricating oil hole groups are sequentially staggered by 30 degrees from left to right along the same rotating direction, a space for containing lubricating oil is formed between two lubricating oil grooves 114a and the inner wall of the bushing 113, the lubricating oil enters a lubricating oil channel from a lubricating oil inlet 114b, then enters the lubricating oil grooves 114a, then enters a space between the bushing 113 and the roller body 112 from each through hole 113a, a lubricating oil film is formed between the bushing 113 and the roller body 112 along with the rotation of the roller body 112 and the bushing 113, and the mechanical abrasion between the bushing 113 and the roller body 112 is effectively improved; the axial lengths of the two lubricating oil grooves 114a are both greater than the axial distance between the leftmost lubricating oil hole group and the rightmost lubricating oil hole group, so that the lubricating oil in the lubricating oil grooves 114a can be ensured to smoothly enter the through holes 113 a. The first group of lubricating oil hole groups rotates anticlockwise (or clockwise) by 30 degrees by taking the central axis of the bush 113 as a center and then is superposed with the second group of lubricating oil hole groups, and the second group of lubricating oil hole groups rotates anticlockwise (or clockwise) by 30 degrees by taking the central axis of the bush 113 as a center and then is superposed with the third group of lubricating oil hole groups. The roller body 112 is in clearance fit with the bush 113, and the bush 113 is also in clearance fit with the roller pin 114, so that the bush 113 is floating, the distribution of a lubricating oil film can be more uniform, the part failure caused by dry friction can be improved, and the working reliability of the roller pin assembly 11 and the service life of the roller pin assembly 11 can be improved. A positioning adjustment hole 114c is formed on the right end surface of the roller pin 114, the positioning adjustment hole 114c may be a square hole or a circular hole, when a circular hole is used, the positioning adjustment hole 114c is not located at the rotation center of the roller pin 114, when the roller pin assembly 11 is assembled into the guide piston 9, the stop pin 110 and the return spring 111 are first installed in the installation hole of the roller pin 114, then, the stopper pin 110 is pressed, the return spring 111 is compressed, the roller pin 114 is fitted into the piston main body 901, since the head end of the stopper pin 110 does not necessarily exactly face the positioning hole in the piston main body 901, the head end of the stopper pin 110 cannot enter the positioning hole to achieve the positioning function, at this time, a tool can be inserted into the positioning adjustment hole 114c, and the roller pin 114 is rotated until the head end of the stopper pin 110 enters the positioning hole of the piston main body 901, so that the assembly process of the fuel injection pump is simplified, and the assembly efficiency of the fuel injection pump is improved.

As shown in fig. 6, the utility model also discloses a guide piston 9, including piston main part 901 and as above the roller pin subassembly 11, the bottom of piston main part 901 is provided with the installation space that is used for holding the roller pin subassembly 11, the installation space is including being used for holding the horizontal hole of roller pin 114 and being used for holding the roller body 112 reaches the vertical groove of bush 113, the horizontal hole with vertical groove mutually perpendicular and intercommunication, the bottom protrusion in of roller body 112 the vertical groove, the inside of horizontal hole corresponds the position of installation hole is provided with the locating hole that is used for holding the head end of stop pin 110. The stopper pin 110 can be used to prevent the roller pin 114 from rotating, and both the roller body 112 and the bushing 113 can rotate.

As shown in fig. 1-6, the utility model also discloses an injection pump, including isobaric delivery valve subassembly 1, the injection pump body 2, plunger matching parts 3, rack adjustment mechanism 4, go up spring disc subassembly 5, plunger spring 6, lower spring holder 7 and hard piece 8, the injection pump body 2 is provided with the mesopore along upper and lower direction, isobaric delivery valve subassembly 1 sets up the top of the injection pump body 2, plunger matching parts 3 rack adjustment mechanism 4 go up spring disc subassembly 5 plunger spring 6 spring holder 7 down with hard piece 8 all installs downthehole, still include as above guide piston 9, guide piston 9 with the bottom of spring holder 7 is connected down. The cam of the diesel engine is matched with a plunger spring 6 of an oil injection pump, so that a guide piston 9 can reciprocate up and down, a plunger rod 302 in a plunger matching part 3 is driven to reciprocate up and down, the top of the plunger rod 302 and a plunger sleeve 301 form a pump cavity, an oil outlet valve cavity and a pressure reducing valve cavity are arranged on the isobaric oil outlet valve component 1, the pump cavity is simultaneously communicated with the oil outlet valve cavity and the pressure reducing valve cavity, an oil outlet valve 101 is arranged in the oil outlet valve cavity, and a pressure reducing valve 102 is arranged in the pressure reducing valve cavity. In the fuel supply stroke, when the oil pressure in the pump chamber rises and is greater than the opening pressure of the delivery valve 101, the delivery valve 101 is opened against the elastic force of the spring, and the high-pressure fuel in the pump chamber enters the high-pressure fuel pipe from the high-pressure fuel outlet hole 103; after the oil supply is finished, the pump chamber becomes a low pressure chamber, and the high pressure fuel in the high pressure fuel line reversely flows into the pump chamber through the high pressure fuel outlet hole 103. When the high-pressure fuel is lower than a certain set value, the delivery valve 101 is closed. If the sum of the pressure wave transmission and superposition of the oil pressure in the high-pressure cavity is higher than the opening pressure of the pressure reducing valve 102, the pressure reducing valve 102 is opened, high-pressure fuel oil enters the low-pressure cavity, and the oil pressure in the oil passage is relieved.

As shown in fig. 3, in the present embodiment, the isobaric oil outlet valve assembly 1 is provided with a lifting threaded hole 104, the isobaric oil outlet valve assembly 1 is further provided with a high-pressure fuel outlet hole 103 communicated with the outside, and the bottom of the high-pressure fuel outlet hole 103 is a spherical surface. The hoisting threaded hole 104 can facilitate hoisting of the fuel injection pump, and a hoisting positioning process during hoisting is simplified, so that the assembly efficiency of the fuel injection pump on a diesel engine is improved, and the bottom of the high-pressure fuel outlet hole 103 is a spherical surface, which is beneficial to reducing stress concentration of the part.

As shown in fig. 7, in the present embodiment, the bottom of the oil jet pump body 2 is provided with an inverted "U" shaped groove 202, the distance between two side walls of the inverted "U" shaped groove 202 increases outwards in the radial direction of the oil jet pump body 2, a first score line 203 is provided on two side walls of the inverted "U" shaped groove 202, and a second score line 902 is provided on the guide piston 9 at a position corresponding to the first score line 203. The distance between the two side walls of the inverted U-shaped groove 202 increases gradually outward in the radial direction of the fuel injection pump body 2, and it is preferable that the two side walls of the inverted U-shaped groove 202 are two slopes or curved surfaces to facilitate the observation of the first scribed line 203 from the outside. The pre-stroke of the plunger rod 302 needs to be adjusted during the process of installing the oil injection pump on the diesel engine, and the pre-stroke of the plunger rod 302 can be adjusted to a designed value only by adjusting the guide piston 9 to a correct height position because the guide piston 9 and the plunger rod 302 are connected into a whole. In practice, the guide piston 9 is adjusted to align the second score line 902 with the first score line 203. Therefore, the design of the first scribed line 203 and the second scribed line 902 can simplify the process of adjusting the height position of the guide piston 9, further simplify the installation process of the fuel injection pump on the diesel engine, facilitate the installation of the fuel injection pump on the diesel engine, and improve the assembly efficiency of the fuel injection pump on the diesel engine.

As shown in fig. 1 and 3, in the present embodiment, the plunger and barrel assembly 3 includes a plunger sleeve 301 and a plunger rod 302 slidably disposed inside the plunger sleeve 301; the plunger sleeve 301 is provided with a plunger sleeve oil return hole 304, the position of the oil injection pump body 2, corresponding to the plunger sleeve oil return hole 304, is provided with an anti-corrosion screw 201, one end, facing the plunger sleeve oil return hole 304, of the anti-corrosion screw 201 is provided with an anti-corrosion concave surface, and the anti-corrosion concave surface is sunken towards the direction far away from the plunger sleeve oil return hole 304; the plunger oil inlet return hole 304 comprises an oil hole part 304a and an opening part 304b positioned on one side of the oil hole part 304a close to the anti-corrosion screw 201, and the opening direction of the opening part 304b faces to the anti-corrosion concave surface; the top of the plunger rod 302 is provided with a guard boss 303. In the present embodiment, the axial height position of the corrosion prevention screw 201 is higher than the axial height position of the oil hole portion 304a, and since the position of the oil hole portion 304a is low, the opening portion 304b is gradually inclined upward in a direction approaching the corrosion prevention screw 201, with the opening direction of the opening portion 304b facing the corrosion prevention concave surface. Traditional anti-corrosion screw adopts planar structure, can splash to the oil spout pump body 2 behind the planar structure's of fuel impact anti-corrosion screw planar structure's the terminal surface, and the utility model discloses well plunger registrates the opening direction of opening 304b of oil gallery 304 towards the anti-corrosion concave surface, and the anti-corrosion concave surface can reduce the fuel and splash to better control the cavitation erosion on can dismantling the anti-corrosion screw 201 of changing, reduce the oil spout pump body 2 and be eroded, be favorable to prolonging the life of the oil spout pump body 2.

As shown in fig. 1 and fig. 2, in this embodiment, the oil injection pump further includes a first positioning pin (not shown in the drawings) and a second positioning pin 13, wherein the upper end and the lower end of the first positioning pin are respectively connected to the isobaric oil outlet valve assembly 1 and the oil injection pump body 2, and the upper end and the lower end of the second positioning pin 13 are respectively connected to the isobaric oil outlet valve assembly 1 and the plunger matching part 3. In the assembling process of injection pump, second locating pin 13 can provide the location foundation for isobaric delivery valve subassembly 1 and plunger matching parts 3, because plunger matching parts 3 adopts the suspension type installation, isobaric delivery valve subassembly 1 and plunger bushing 301 pass through the screw connection for the part, and first locating pin can provide the location foundation for this part and the injection pump body 2 for the assembly is more simple and convenient. As shown in fig. 2, a first locating pin mounting groove 105 for accommodating the first locating pin is formed in the bottom of the isobaric oil outlet valve assembly 1, the first locating pin mounting groove 105 is communicated with the outside along the radial direction of the oil injection pump body 2, when a component formed by the plunger sleeve 301 and the isobaric oil outlet valve assembly 1 is assembled with the oil injection pump body 2, since a first locating pin mounting hole on the isobaric oil outlet valve assembly 1 is located on the lower end surface of the isobaric oil outlet valve assembly 1, the position of the first locating pin mounting hole is inconvenient to observe, and the diameter of the first locating pin mounting hole is not large enough to adjust the position, so that the exposed part of the first locating pin on the oil injection pump body 2 is just inserted into the first locating pin mounting hole on the isobaric oil outlet valve assembly 1. Therefore, the utility model discloses design first locating pin mounting groove 105 with the first locating pin mounting hole on the isobaric delivery valve subassembly 1, the workman can direct observation first locating pin mounting groove 105 from the outside, only need during the assembly with spray the first locating pin on the oil pump body 2 expose the part align pack into first locating pin mounting groove 105 in can, it is more convenient when making the part that plunger bushing 301 and isobaric delivery valve subassembly 1 constitute and the oil pump body 2 equipment, the assembly process of fuel injection pump has been simplified, the assembly efficiency of fuel injection pump assembly has been improved.

As shown in fig. 1 and 5, the upper spring holder assembly 5 includes an upper spring holder main body and two sealing rings 53, the upper spring holder main body includes an upper large cylinder 51 and a lower small cylinder 52 which are sequentially arranged from top to bottom, the plunger spring 6 abuts against the bottom of the large cylinder, an inner hole for the plunger rod 302 to pass through is arranged in the middle of the upper spring holder main body, the circumference of the upper large cylinder 51 and the top of the inner hole are respectively provided with one sealing ring 53, and the sealing rings 53 can prevent the mixed oil from leaking downwards and polluting the lubricating oil; the bottom of the lower small cylinder 52 is provided with an assembling threaded hole 54, the axis direction of the assembling threaded hole 54 is along the up-down direction, because the gap between the upper large cylinder 51 and the oil injection pump body 2 is smaller and the sealing ring 53 is arranged between the upper spring disc assembly 5 and the oil injection pump body 2, when the upper spring disc assembly 5 is installed or disassembled, the upper spring disc assembly 5 is difficult to move along the axis direction of the middle hole of the oil injection pump body 2, after the assembling threaded hole 54 is arranged at the bottom of the lower small cylinder 52, the upper spring disc assembly 5 can be directly in threaded fit with the assembling threaded hole 54 through a tool when the upper spring disc assembly 5 is installed or disassembled, the upper spring disc assembly 5 is driven to move through the tool, so that the upper spring disc assembly 5 is installed or disassembled, the assembling process when the oil injection pump is further simplified, and the assembling efficiency when. A gasket 15 is arranged between the upper spring disc assembly 5 and the middle hole shoulder blade surface of the oil injection pump body 2, and the pretightening force of the plunger spring 6 can be adjusted by adjusting the thickness of the gasket 15, such as replacing the gaskets 15 with different thicknesses, thinning the gaskets 15 and the like.

As shown in fig. 2, an air bleed screw mounting hole communicated with the pump cavity is formed in the oil injection pump body 2, an air bleed screw 12 is arranged in the air bleed screw mounting hole, and the air bleed screw 12 can be detached and loosened to discharge air in the oil injection pump. As shown in fig. 1 and 2, the oil injection pump body 2 is provided with an air vent 14, and the air vent 14 enables a cavity of the oil injection pump body 2 located on the lower side of the upper spring disc assembly 5 to be communicated with the outside, so as to balance the internal and external air pressures of the oil injection pump body 2 when the guide piston 9 moves.

Finally, it is noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A roller pin assembly, characterized by: the device comprises a stop pin (110), a return spring (111), a roller body (112), a bushing (113) which is assembled in the roller body (112) in a clearance mode, and a roller pin (114) which is assembled in the bushing (113) in a clearance mode, wherein the left end and the right end of the roller pin (114) are provided with protruding parts protruding out of the bushing (113); a lubricating oil groove (114 a) is formed in the outer wall of the roller pin (114), a lubricating oil channel is formed in the roller pin (114), the head end of the lubricating oil channel is communicated with the outside, and the tail end of the lubricating oil channel is communicated with the lubricating oil groove (114 a); a plurality of through holes (113 a) are distributed on the bush (113), and the through holes (113 a) can guide the lubricating oil in the lubricating oil groove (114 a) into the space between the roller body (112) and the bush (113); the protruding portion is provided with an installation hole, the axis of the installation hole is along the radial direction of the roller pin (114), the return spring (111) is installed in the installation hole, the head end of the stop pin (110) extends out of the protruding portion, and the tail end of the stop pin (110) is located in the installation hole and connected with the return spring (111).

2. The roller pin assembly of claim 1, wherein: the through holes (113 a) form N groups of lubricating oil hole groups at intervals along the axial direction of the bush (113), and each group of lubricating oil hole groups consists of M through holes (113 a) arranged at intervals along the circumferential direction of the bush (113); p lubricating oil grooves (114 a) are arranged along the circumferential direction of the roller pin (114) at intervals, and the axial length of the P lubricating oil grooves (114 a) is larger than the axial distance between the left lubricating oil hole group and the right lubricating oil hole group.

3. The roller pin assembly of claim 2, wherein: the distance between two adjacent groups of lubricating oil hole groups is the same, the distance between two adjacent through holes (113 a) of each group of lubricating oil hole groups is the same, and the distance between two adjacent lubricating oil grooves (114 a) is the same; and the lubricating oil hole groups of each group are sequentially staggered by beta degrees from left to right along the same rotating direction.

4. The roller pin assembly of claim 1, wherein: a positioning adjusting hole (114 c) is formed in the end face of one side of the roller pin (114); and a lubricating oil inlet (114 b) is formed in the protruding part, and the head end of the lubricating oil channel is communicated with the lubricating oil inlet (114 b).

5. A pilot piston, characterized by: the roller pin assembly (11) comprises a piston main body (901) and the roller pin assembly (11) as claimed in any one of claims 1 to 4, wherein the bottom of the piston main body (901) is provided with an installation space for accommodating the roller pin assembly (11), the installation space comprises a transverse hole for accommodating the roller pin (114) and a vertical groove for accommodating the roller body (112) and the bushing (113), the transverse hole and the vertical groove are perpendicular to each other and are communicated, the bottom of the roller body (112) protrudes out of the vertical groove, and a positioning hole for accommodating the head end of the stop pin (110) is arranged in the transverse hole at a position corresponding to the installation hole.

6. The utility model provides an injection pump, includes isobaric delivery valve subassembly (1), the injection pump body (2), plunger matching parts (3), rack adjustment mechanism (4), goes up spring plate subassembly (5), plunger spring (6), lower spring holder (7) and hard piece (8), injection pump body (2) are provided with the mesopore along upper and lower direction, isobaric delivery valve subassembly (1) sets up the top of the injection pump body (2), plunger matching parts (3), rack adjustment mechanism (4), go up spring plate subassembly (5), plunger spring (6) lower spring holder (7) with hard piece (8) are all installed downthehole, its characterized in that: further comprising a pilot piston (9) according to claim 5, the pilot piston (9) being connected to the bottom of the lower spring seat (7).

7. The fuel injection pump of claim 6, wherein: the isobaric oil outlet valve assembly (1) is provided with a hoisting threaded hole (104), the isobaric oil outlet valve assembly (1) is further provided with a high-pressure fuel oil outlet hole (103) communicated with the outside, and the bottom of the high-pressure fuel oil outlet hole (103) is a spherical surface.

8. The fuel injection pump of claim 7, wherein: the oil injection pump body (2) is characterized in that an inverted U-shaped groove (202) is formed in the bottom of the oil injection pump body (2), the distance between two side walls of the inverted U-shaped groove (202) increases progressively along the radial direction of the oil injection pump body (2), first scribed lines (203) are arranged on the two side walls of the inverted U-shaped groove (202), and second scribed lines (902) are arranged on the guide piston (9) corresponding to the positions of the first scribed lines (203).

9. The fuel injection pump of claim 8, wherein: the plunger matching part (3) comprises a plunger sleeve (301) and a plunger rod (302) which is arranged inside the plunger sleeve (301) in a sliding mode; the plunger sleeve (301) is provided with a plunger sleeve oil return hole (304), an anti-corrosion screw (201) is arranged at a position, corresponding to the plunger sleeve oil return hole (304), of the oil injection pump body (2), an anti-corrosion concave surface is arranged at one end, facing the plunger sleeve oil return hole (304), of the anti-corrosion screw (201), and the anti-corrosion concave surface is sunken towards a direction far away from the plunger sleeve oil return hole (304); the plunger nesting oil return hole (304) comprises an oil hole part (304 a) and an opening part (304 b) positioned on one side of the oil hole part (304 a) close to the anti-corrosion screw (201), and the opening direction of the opening part (304 b) faces to the anti-corrosion concave surface; the top of the plunger rod (302) is provided with a protection boss (303).

10. The fuel injection pump of claim 9, wherein: the oil injection pump further comprises a first positioning pin and a second positioning pin (13), wherein the upper end and the lower end of the first positioning pin are respectively connected with the isobaric oil outlet valve component (1) and the oil injection pump body (2), and the upper end and the lower end of the second positioning pin (13) are respectively connected with the isobaric oil outlet valve component (1) and the plunger matching part (3); the bottom of the isobaric oil outlet valve component (1) is provided with a first positioning pin installation groove (105) used for containing the first positioning pin, and the first positioning pin installation groove (105) is communicated with the outside along the radial direction of the oil injection pump body (2).