CN105422346A - Plunger and barrel assembly for high-flow high-rotation speed rotor type high pressure common rail variable pump - Google Patents

Plunger and barrel assembly for high-flow high-rotation speed rotor type high pressure common rail variable pump Download PDF

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Publication number
CN105422346A
CN105422346A CN201510926807.2A CN201510926807A CN105422346A CN 105422346 A CN105422346 A CN 105422346A CN 201510926807 A CN201510926807 A CN 201510926807A CN 105422346 A CN105422346 A CN 105422346A
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CN
China
Prior art keywords
plunger
tappet
bushing
oil
cavity
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CN201510926807.2A
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Chinese (zh)
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CN105422346B (en
Inventor
杨显锋
姜伟
徐春龙
赵中余
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China North Engine Research Institute Tianjin
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China North Engine Research Institute Tianjin
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102Mechanical drive, e.g. tappets or cams
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston

Abstract

The invention discloses a plunger and barrel assembly for a high-flow high-rotation speed rotor type high pressure common rail variable pump. The plunger and barrel assembly comprises a plunger sleeve, a plunger arranged in a plunger cavity of the plunger sleeve, and a tappet arranged on the periphery of the middle lower part of the plunger sleeve in a sleeving manner, wherein the bottom of the plunger is fixed in the tappet through a tappet gasket and a stair platform in the tappet; the tappet gasket is detachably fixed at the bottom of the inner side of the tappet; a plunger spring is arranged at the outer part of the tappet in a sleeving manner; one end of the plunger spring is fixed at the bottom of a stair of the plunger sleeve, and the other end of the plunger spring is fixed at the top of a stair of the outer side of the tappet; an oil inlet channel and an oil outlet channel which are vertical to the plunger cavity and are communicated with an upper cavity of the plunger cavity are formed in the plunger sleeve; bedding-in clearance is formed between the plunger and the plunger cavity; oil is sucked and pressed through the reciprocating motion of the plunger in the plunger cavity; an oil return channel is formed in the plunger sleeve; the oil return channel is communicated with a circular groove in the bottom of the plunger cavity; and steel balls are arranged between the oil return channel and the outer wall of the plunger sleeve, and are arranged at the bottom of the oil return channel. According to the plunger and barrel assembly, through the cooperation of all the parts, the contact stress of a plunger and barrel assembly matching surface is reduced, the abrasion of the plunger and barrel assembly is reduced, the sealing clearance is maintained, and the oil supply efficiency and reliability of the variable pump are improved.

Description

Large discharge, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts
Technical field
The invention belongs to engine fuel system field, especially relate to a kind of large discharge, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts.
Background technique
Along with the continuous lifting to diesel engine properties demand, the pressure of diesel engine big-flow high-pressure common rail variable displacement pump, flow, rotating speed improve thereupon, these of high-pressure common rail variable displacement pump improve the risk considerably increasing variable displacement pump and break down, as plunger coupled parts clamping stagnation, fitting surface wearing and tearing, high pressure sealing leakage etc., the fuel feeding efficiency of variable displacement pump is caused to reduce, even operational failure.
Different from small displacement variable displacement pump, large discharge variable displacement pump many employings oil lubricating, which increases the risk being entered engine oil passage by the diesel oil of plunger coupled parts clearance leakage, affects other parts lubrication; In addition, variable displacement pump piston structure mostly also is integrated type, during work, plunger bottom surface directly contacts with cam mechanism, frictional force particularly on plunger and cam contact surface is applied directly on the fitting surface of plunger coupled parts by the transmission of plunger rod, increase contact stress on plunger rod and plunger bushing surface of contact, accelerate wearing and tearing, reduce the reliability of variable displacement pump.
In view of the above defect existed, invent a kind of large discharge, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, under the condition ensureing structural strength, how to optimize design of part, and improve sealing configuration, effective raising variable displacement pump operational reliability and fuel feeding efficiency, become the problem of those skilled in the art's research.
Summary of the invention
In view of this, the present invention aims to provide a kind of contact stress when significantly reducing plunger up force feed on plunger coupled parts surface of contact, reduces the wearing and tearing of plunger coupled parts fitting surface, maintains seal clearance, improve the plunger coupled parts of the reliability of variable displacement pump.
For achieving the above object, technological scheme of the present invention is achieved in that
A kind of large discharge, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, comprise plunger bushing, plunger and tappet, described plunger is located in the plunger cavity of described plunger bushing, described tappet is sheathed on the periphery of described plunger bushing middle and lower part, the bottom of described plunger is fixed in described tappet by the ladder platform in tappet packing ring and tappet, described tappet packing ring is removably fixed on the bottom inside described tappet, the outer cover of described tappet is provided with piston spring, one end of described piston spring is fixed on bottom the step of described plunger bushing, the other end is fixed on the step top outside described tappet, oil input channel that is vertical with described plunger cavity and that communicate with plunger cavity epicoele and oil road is provided with in described plunger bushing, bedding-in gap is had between described plunger and described plunger cavity, oil suction and force feed is come by the to-and-fro motion of plunger in described plunger cavity, back oil road is provided with in described plunger bushing, described back oil road communicates with the annular groove bottom described plunger cavity, flow to the back oil road of variable displacement pump through annular groove and back oil road by the fuel oil of plunger and plunger cavity clearance leakage during the up force feed of plunger, finally flow back to fuel tank, between described back oil road and described plunger bushing outer wall and the bottom of described back oil road is equipped with steel ball, the outlet of shutoff oil return circuit bottom plunger bushing, make oil return oil return circuit by design oil circuit entering variable pump in plunger bushing.
In described plunger bushing, the below of described annular groove is provided with O type rubber seal ring recess, is provided with O type rubber seal in described O type rubber seal ring recess.
Oil road diameter on described plunger bushing is less than oil input channel diameter.
When described plunger motion is to lower dead center, the upper-end surface of described plunger higher than the lower end surface of described epicoele, and lower than the upper-end surface of described oil input channel and described oil road; Described plunger bushing epicoele diameter is greater than described plunger diameter.
Described plunger bushing epicoele diameter transition place retains sharp edge.
Described plunger comprises plunger rod and plunger disc, and described plunger rod and described plunger disc are split-type structural, and described plunger disc is interference fitted in the bottom of described plunger rod.
Described plunger upper and lower both ends of the surface edge rounding.
The uniform multiple lubrication hole for lubricating plunger bushing outer wall and tappet contact internal walls place of described tappet upper end wall circumference; Have multiple hydraulic resistance balance grooves that circumference is uniform near described tappet inwall bottom and described plunger disc cooperation place, described multiple hydraulic resistance balance groove multiple hydraulic resistance balance holes circumferential uniform with described tappet outer wall bottom communicate.
Described tappet packing ring is fixedly connected with described tappet by jump ring, and described tappet outer wall bottom is provided with two jump ring handling holes be connected with jump ring mounting groove, and described jump ring handling hole is through hole.
Described plunger bushing lower end edge plunger cavity axis is provided with seal ring loading and unloading capacity groove to O type rubber seal ring recess.
Relative to prior art, large discharge of the present invention, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts have following advantage:
(1) be separated by between plunger of the present invention and cam mechanism tappet packing ring, tappet packing ring contacts with cam mechanism, and coordinates with tappet, plunger rod contacts, and tappet inwall and plunger bushing wall contacts; When there is relative displacement in cam mechanism and tappet packing ring, the frictional force part that tappet packing ring is subject to is passed to plunger bushing outer wall by tappet, the all frictional force avoiding tappet packing ring to be subject to are passed on plunger cavity wall through plunger, thus the contact stress reduced on couple fitting surface, reduce the wearing and tearing of couple, maintain seal clearance, improve fuel feeding efficiency and the reliability of variable displacement pump.
(2) add O type rubber seal in plunger bushing, block the oil circuit that machine oil enters diesel oil, to reduce consumption of lubricating oil, to improve engine combustion by seal ring.
(3) the oil road diameter on plunger bushing is less than oil input channel diameter, under the prerequisite not affecting oil suction efficiency and fuel flow communication, reduce dead volume in plunger cavity, improves variable displacement pump fuel feeding efficiency.
(4) when plunger motion is to lower dead center, in the epicoele in plunger bushing of the upper-end surface of plunger rod; Plunger bushing epicoele diameter is greater than plunger diameter, can prevent plunger clamping stagnation at plunger force feed, diameter when becoming large.
(5) plunger bushing epicoele diameter transition place retains sharp edge, to strengthen the sealing in couple gap.
(6) plunger adopts split modular structure, plunger is made up of plunger rod and plunger disc, and plunger diameter on active section is unchanged, so as by tolerance of size control more accurate, less plunger gap can be obtained, reduce leakage, improve variable displacement pump fuel feeding efficiency; Plunger disc is interference fitted in the bottom of described plunger rod, simple shape, be convenient to processing, good manufacturability.
(7) plunger upper and lower both ends of the surface edge rounding, concentrates with stress when reducing force feed.
(8) tappet upper end wall circumference is uniform multiple for lubricating plunger bushing outer wall and the right lubrication hole of tappet contact internal walls, to strengthen the lubrication between the two; Circumferential uniform multiple hydraulic resistance balance grooves are had near inwall bottom and plunger disc cooperation place, it communicates with the uniform multiple hydraulic resistance balance hole of circumference, outer wall bottom, pressure in plunger bushing, plunger and tappet are formed in oil suction and force feed process seal space is balanced with extraneous, does not affect the motion of plunger.
(9) there are two through holes be connected with jump-ring slot tappet outer wall bottom, facilitates the dismounting of jump ring.The setting of jump ring handling hole, facilitates the handling of jump ring.
(10) seal ring loading and unloading capacity groove, facilitates the dismounting of O type rubber seal.
(11) the O type circle in plunger cavity annular groove is made up of wear-resisting, corrosion resistant rubber, improves the working life of seal ring and the reliability of variable displacement pump.
(12) tappet packing ring is hard, wear-resistant material, improves the reliability of movement parts.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the sectional drawing of plunger bushing of the present invention;
Fig. 3 is the enlarged view in A portion in Fig. 2;
Fig. 4 is the longitudinal sectional drawing of plunger bushing other direction;
Fig. 5 be plunger bushing along B to sectional drawing;
Fig. 6 is the structural representation of plunger;
Fig. 7 is the left view of plunger;
Fig. 8 is the structural representation of tappet;
Fig. 9 is the sectional drawing of Fig. 8;
Figure 10 is the left view of Fig. 9.
1-plunger bushing, 2-plunger rod, 3-O type rubber seal, 4-tappet, 5-plunger disc, 6-jump ring, 7-tappet packing ring, 8-steel ball, 9-piston spring, 11-oil input channel, 12-oil road, 13-epicoele, 14-back oil road, 15-lubrication hole, 16-sharp edge, 17-annular groove, 18-seal ring loading and unloading capacity groove, 19-plunger cavity, 21-rounding, 41-hydraulic resistance balance groove, 42-hydraulic resistance balance hole, 43-jump ring handling hole.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As Fig. 1-10, a kind of large discharge, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, comprise plunger bushing 1, plunger and tappet 4, described plunger is located in the plunger cavity 19 of described plunger bushing 1, described tappet 4 is sheathed on the periphery of described plunger bushing 1 middle and lower part, the bottom of described plunger is fixed in described tappet 4 by the ladder platform in tappet packing ring 7 and tappet 4, described tappet packing ring 7 is removably fixed on the bottom inside described tappet 4, the outer cover of described tappet 4 is provided with piston spring 9, one end of described piston spring 9 is fixed on bottom the step of described plunger bushing 1, the other end is fixed on the step top outside described tappet 4, oil input channel 11 that is vertical with described plunger cavity 19 and that communicate with plunger cavity epicoele and oil road 12 is provided with in described plunger bushing 1, bedding-in gap is had between described plunger and described plunger cavity 19, oil suction and force feed is come by the to-and-fro motion of plunger in described plunger cavity 19, back oil road 14 is provided with in described plunger bushing 1, described back oil road 14 communicates with the annular groove 17 bottom described plunger cavity 19, between described back oil road 14 and described plunger bushing 1 outer wall and the bottom of described back oil road 14 is equipped with steel ball 8.
In described plunger bushing 1, the below of described annular groove 17 is provided with O type rubber seal 3 groove, is provided with O type rubber seal 3 in described O type rubber seal 3 groove.
Oil road 12 diameter on described plunger bushing 1 is less than oil input channel 11 diameter.
When described plunger motion is to lower dead center, the upper-end surface of plunger higher than the lower end surface of the epicoele 13 in plunger bushing 1, and lower than the upper-end surface of oil input channel 11 and oil road 12; Plunger bushing 1 epicoele 13 diameter is greater than plunger diameter.The top of epicoele 13 is higher than the upper-end surface of oil input channel 11 and oil road 12, and bottom is lower than the lower end surface of oil input channel 11 and oil road 12.
Described plunger bushing 1 epicoele 13 diameter transition place retains sharp edge 16.
Described plunger comprises plunger rod 2 and plunger disc 5, and described plunger rod 2 is split-type structural with described plunger disc 5, and described plunger disc 5 is interference fitted in the bottom of described plunger rod 2.
Described plunger upper and lower both ends of the surface edge rounding 21.
The uniform multiple lubrication hole 15 for lubricating plunger bushing 1 outer wall and tappet 4 contact internal walls place of described tappet 4 upper end wall circumference; Have multiple hydraulic resistance balance grooves 41 that circumference is uniform near described tappet 4 inwall bottom and described plunger disc 5 cooperation place, described multiple hydraulic resistance balance groove 41 multiple hydraulic resistance balance holes 42 circumferential uniform with described tappet 4 outer wall bottom communicate.
Described tappet packing ring 7 is fixedly connected with described tappet 4 by jump ring 6, and described tappet 4 outer wall bottom is provided with two jump ring handling holes 43 be connected with jump ring 6 mounting groove, and described jump ring handling hole 43 is through hole.
Described plunger bushing 1 lower end edge plunger cavity axis is provided with seal ring loading and unloading capacity groove 18 to O type rubber seal 3 groove.
O type rubber seal 3 in described plunger cavity 19 annular groove 17 is made up of wear-resisting, corrosion resistant rubber.
Described tappet packing ring 7 is hard, wear-resistant material.
Working principle: plunger bushing 1 and plunger couple each other, lay respectively on the corresponding cooperation position of tappet 4 together with the plunger disc 5 of plunger rod 2, tappet packing ring 7, finally kept off by jump ring 6 solid, under the acting in conjunction of cam mechanism and piston spring 9, triple interaction, to move simultaneously.
Plunger cavity bottom is provided with upper and lower twice annular groove 17, upper annular groove 17 accepts the leakage of oil in plunger gap, the back oil road 14 of leakage of oil in plunger bushing 1 flows out plunger bushing 1, after entering the seal space formed by two O type circles, the variable pump housing, plunger bushing 1 body, the back oil road on the pump housing flows in fuel tank.Lower annular groove 17 is O type ring recess, install O type rubber seal 3 additional the machine oil of the diesel oil on top, plunger gap and bottom is isolated, the combination of two annular grooves 17 can prevent diesel oil from entering into engine oil passage, avoids changing oil formulation, affects the lubrication effect at other positions of motor.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a large discharge, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, it is characterized in that: comprise plunger bushing, plunger and tappet, described plunger is located in the plunger cavity of described plunger bushing, described tappet is sheathed on the periphery of described plunger bushing middle and lower part, the bottom of described plunger is fixed in described tappet by the ladder platform in tappet packing ring and tappet, described tappet packing ring is removably fixed on the bottom inside described tappet, the outer cover of described tappet is provided with piston spring, one end of described piston spring is fixed on bottom the step of described plunger bushing, the other end is fixed on the step top outside described tappet, oil input channel that is vertical with described plunger cavity and that communicate with plunger cavity epicoele and oil road is provided with in described plunger bushing, bedding-in gap is had between described plunger and described plunger cavity, oil suction and force feed is come by the to-and-fro motion of plunger in described plunger cavity, back oil road is provided with in described plunger bushing, described back oil road communicates with the annular groove bottom described plunger cavity, between described back oil road and described plunger bushing outer wall and the bottom of described back oil road is equipped with steel ball.
2. large discharge according to claim 1, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, it is characterized in that: in described plunger bushing, the below of described annular groove is provided with O type rubber seal ring recess, in described O type rubber seal ring recess, be provided with O type rubber seal.
3. large discharge according to claim 1 and 2, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, is characterized in that: the oil road diameter on described plunger bushing is less than oil input channel diameter.
4. the large discharge according to any one of claim 1-3, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, it is characterized in that: when described plunger motion is to lower dead center, the upper-end surface of described plunger higher than the lower end surface of described epicoele, and lower than the upper-end surface of described oil input channel and described oil road; Described plunger bushing epicoele diameter is greater than described plunger diameter.
5. large discharge according to claim 4, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, is characterized in that: described plunger bushing epicoele diameter transition place retains sharp edge.
6. the large discharge according to any one of claim 1-5, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, it is characterized in that: described plunger comprises plunger rod and plunger disc, described plunger rod and described plunger disc are split-type structural, and described plunger disc is interference fitted in the bottom of described plunger rod.
7. large discharge according to claim 6, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, is characterized in that: described plunger upper and lower both ends of the surface edge rounding.
8. the large discharge according to claim 6 or 7, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, is characterized in that: the uniform multiple lubrication hole for lubricating plunger bushing outer wall and tappet contact internal walls place of described tappet upper end wall circumference; Have multiple hydraulic resistance balance grooves that circumference is uniform near described tappet inwall bottom and described plunger disc cooperation place, described multiple hydraulic resistance balance groove multiple hydraulic resistance balance holes circumferential uniform with described tappet outer wall bottom communicate.
9. large discharge according to claim 1, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, it is characterized in that: described tappet packing ring is fixedly connected with described tappet by jump ring, described tappet outer wall bottom is provided with two jump ring handling holes be connected with jump ring mounting groove, and described jump ring handling hole is through hole.
10. large discharge according to claim 2, high rotating speed rotator type high-pressure common rail variable displacement pump plunger coupled parts, is characterized in that: described plunger bushing lower end edge plunger cavity axis is provided with seal ring loading and unloading capacity groove to O type rubber seal ring recess.
CN201510926807.2A 2015-12-11 2015-12-11 Big flow, high rotating speed rotator type high-pressure common rail variable pump plunger matching parts Active CN105422346B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106499558A (en) * 2017-01-04 2017-03-15 北京亚新科天纬油泵油嘴股份有限公司 A kind of plunger matching parts of anti-leak oil-stain-preventing and apply its injection pump
CN107654481A (en) * 2017-09-30 2018-02-02 中国北方发动机研究所(天津) A kind of crank-shaft link neck oil pocket sealing structure
CN109653921A (en) * 2018-10-30 2019-04-19 中国北方发动机研究所(天津) A kind of injection pump plunger set of anti-plunger clamping stagnation

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WO1993007385A1 (en) * 1991-09-28 1993-04-15 Lucas Industries Public Limited Company Fuel pump
US5402764A (en) * 1992-11-07 1995-04-04 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
DE102011085605A1 (en) * 2011-11-02 2013-02-07 Continental Automotive Gmbh Pump unit for fuel pump utilized in common-rail injection system for internal combustion engine of motor car, has spring assembly axially arranged between plunger and roller shoe to limit force transferred by roller shoe on pump piston
CN104204501A (en) * 2012-03-19 2014-12-10 罗伯特·博世有限公司 High-pressure pump
CN204126791U (en) * 2014-07-25 2015-01-28 博世汽车柴油系统有限公司 High pressure fuel pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007385A1 (en) * 1991-09-28 1993-04-15 Lucas Industries Public Limited Company Fuel pump
US5402764A (en) * 1992-11-07 1995-04-04 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
DE102011085605A1 (en) * 2011-11-02 2013-02-07 Continental Automotive Gmbh Pump unit for fuel pump utilized in common-rail injection system for internal combustion engine of motor car, has spring assembly axially arranged between plunger and roller shoe to limit force transferred by roller shoe on pump piston
CN104204501A (en) * 2012-03-19 2014-12-10 罗伯特·博世有限公司 High-pressure pump
CN204126791U (en) * 2014-07-25 2015-01-28 博世汽车柴油系统有限公司 High pressure fuel pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106499558A (en) * 2017-01-04 2017-03-15 北京亚新科天纬油泵油嘴股份有限公司 A kind of plunger matching parts of anti-leak oil-stain-preventing and apply its injection pump
CN107654481A (en) * 2017-09-30 2018-02-02 中国北方发动机研究所(天津) A kind of crank-shaft link neck oil pocket sealing structure
CN109653921A (en) * 2018-10-30 2019-04-19 中国北方发动机研究所(天津) A kind of injection pump plunger set of anti-plunger clamping stagnation

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