CN105370465A - Deformable compensation type high-pressure variable pump plunger - Google Patents
Deformable compensation type high-pressure variable pump plunger Download PDFInfo
- Publication number
- CN105370465A CN105370465A CN201510932411.9A CN201510932411A CN105370465A CN 105370465 A CN105370465 A CN 105370465A CN 201510932411 A CN201510932411 A CN 201510932411A CN 105370465 A CN105370465 A CN 105370465A
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- China
- Prior art keywords
- plunger
- cavity
- high pressure
- variable pump
- bushing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps 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
- F02M59/10—Pumps 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
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention provides a deformable compensation type high-pressure variable pump plunger. The deformable compensation type high-pressure variable pump plunger comprises a plunger rod, a plunger bushing, a plunger spring, a plunger base and an eccentric cam assembly. A plunger cavity is fixedly formed in the plunger bushing, and the plunger rod is inserted from the bottom of the plunger cavity and is in clearance fit with the plunger cavity; a cylindrical stepped deformation compensation groove is fixedly formed in the top end of the plunger rod, and the bottom end of the plunger rod is fixedly connected to the plunger base; the plunger spring is fixedly arranged between the plunger bushing and the plunger base; a low-pressure oil inlet cavity and a high-pressure oil outlet cavity both communicated with the plunger cavity are fixedly formed in the upper end of the plunger bushing, and a low-pressure oil discharge cavity communicated with the plunger cavity is fixedly formed in the lower end of the plunger bushing; the eccentric cam assembly and the plunger base are installed in a matched mode. According to the deformable compensation type high-pressure variable pump plunger, dynamic sealing of a plunger and barrel assembly is realized without clamping stagnation, the plunger and barrel assembly is good in sealing performance and power performance within the full working pressure range, and the working requirement of an ultrahigh-pressure oil pump is met.
Description
Technical field
The invention belongs to engine fuel supply system technical field, especially relate to a kind of contradiction for better solving high pressure variable pump plunger couple sealing and plunger coupled parts working stability and optimize a kind of deformable compensation high pressure variable pump plunger of fuel oil supply system ultrahigh pressure fuel pressure operating conditions lower plunger couple sealability.
Background technique
For reaching the emission regulation demands of motor and improving Economy and handling, more and more higher to the flexibility requirements of fuel injection system spray characteristic, high pressure common rail fuel injection system due to its flexibility controlled, become the first-selection of diesel fuel injection system.
As provide to system the high pressure oil pump of high pressure fuel be safeguards system high pressure fuel supply critical component, its Main Function is added by low-voltage fuel to be pressed into high pressure fuel, what require along with high pressure oil pump charge oil pressure constantly increases, plunger coupled parts produces deformation under high oil pressure, couple matching gap is made to become large, cause the decline of its sealability, volumetric efficiency reduction, even cannot set up high pressure.If the too small clamping stagnation that can cause again plunger of plunger coupled parts primary clearance, the reliability of impact to voltage variable displacement pump work.Therefore the plunger head of high pressure variable displacement pump processes the deformation-compensated hole of a suitable shape, radial deformation when utilizing plunger to work makes the matching gap of itself and plunger bushing be in suitable number range, to make up the plunger bushing distortion under high pressure, can effectively solve this difficult problem.
Summary of the invention
In view of this, the present invention is intended to propose a kind of deformable compensation high pressure variable pump plunger for improving plunger coupled parts sealing and plunger coupled parts working stability contradiction, the deformation-compensated hole of a suitable shape is processed at the plunger head of high pressure variable displacement pump, be full of therebetween by introducing high pressure fuel, produce certain radial deformation, the distortion had along with fuel pressure and plunger bushing due to this radial deformation increases and the feature of increase, make the matching gap of couple can remain on an appropriate number range, thus realize the dynamic seal (packing) of the plunger coupled parts of not clamping stagnation condition, realize the favorable sealing property of plunger coupled parts in full range of working pressure and power performance is stablized, meet the job requirement of superpressure oil pump.
For achieving the above object, technological scheme of the present invention is achieved in that
A kind of deformable compensation high pressure variable pump plunger, comprises plunger rod, plunger bushing, piston spring, plunger base and eccentric cam assembly;
Be installed with a plunger cavity in described plunger bushing, described plunger rod is inserted by the bottom of described plunger cavity, and this plunger rod and described plunger cavity Spielpassung;
The top of described plunger rod is installed with the stepped deformation-compensated groove of a cylinder, and bottom is fixedly connected with described plunger base;
Described piston spring is set in the outer side surface of described plunger rod, and this piston spring one end is fixedly connected with described plunger base, and the other end is fixedly connected with described plunger bushing;
The upper end of described plunger bushing is installed with the low pressure oil suction chamber that is communicated with described plunger cavity respectively and high pressure goes out oil pocket, and the lower end of described plunger bushing is installed with the low pressure be communicated with described plunger cavity and unloads oil pocket;
Described eccentric cam assembly and described plunger base engagement are installed.
Further, the bottom surface of described plunger base is a plane vertical with plunger rod.
Further, described eccentric cam assembly comprises eccentric cam shaft, axle sleeve and cam ring, described cam Ring current distribution is installed with a circular mounting hole, the circular mounting hole of this cam ring is set in the outside of described eccentric cam shaft by axle sleeve, the upper surface of described cam ring is a plane coordinated with described plunger base contacts.
Further, when described plunger rod stretches into ultimate range in described plunger cavity, the top of this plunger rod goes out the oil outlet of oil pocket lower than the filler opening of described low pressure oil suction chamber and high pressure.
Further, when described plunger rod stretches into ultimate range in described plunger cavity, piston spring is in compressive state.
Further, the central axis of the stepped deformation-compensated groove of described cylinder and the central axes of described plunger rod.
Further, the central axis of described plunger rod and the central axes of described piston spring.
Further, described eccentric cam shaft and described axle sleeve interference fit.
Relative to prior art, deformable of the present invention compensation high pressure variable pump plunger has following advantage:
(1) deformable of the present invention compensation high pressure variable pump plunger, the deformation-compensated hole of a suitable shape is processed at the plunger head of high pressure variable displacement pump, be full of therebetween by introducing high pressure fuel, produce certain radial deformation, the distortion had along with fuel pressure and plunger bushing due to this radial deformation increases and the feature of increase, make the matching gap of couple can remain on an appropriate number range, solve the contradiction of high pressure variable pump plunger couple sealing and plunger coupled parts working stability better, optimize the sealability of fuel oil supply system ultrahigh pressure fuel pressure operating conditions lower plunger couple, achieve the dynamic seal (packing) of the plunger coupled parts of not clamping stagnation condition, realize the favorable sealing property of plunger coupled parts in full range of working pressure and power performance is stablized, meet the job requirement of superpressure oil pump.
(2) deformable of the present invention compensation high pressure variable pump plunger, suitably can reduce the requirement to plunger coupled parts machining gap, reduce the gap under plunger coupled parts working state when plunger is suitably out of shape, the job requirement of superpressure oil pump can be met equally.
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 the compensation high pressure variable of the deformable described in embodiment of the present invention pump plunger structural representation;
Fig. 2 is the plunger bushing structural representation described in the embodiment of the present invention;
Fig. 3 is the plunger rod structural representation described in the embodiment of the present invention;
Fig. 4 is the plunger spring structures schematic diagram described in the embodiment of the present invention;
Fig. 5 is the eccentric cam shaft structural representation described in the embodiment of the present invention;
Fig. 6 is the cam ring structural representation described in the embodiment of the present invention;
Fig. 7 is the axle sleeve structure schematic diagram described in the embodiment of the present invention.
Description of reference numerals:
1-plunger rod, the stepped deformation-compensated groove of 11-cylinder, 2-plunger bushing, 21-low pressure oil suction chamber, 22-high pressure goes out oil pocket, 23-low pressure unloads oil pocket, 24-plunger cavity, 3-piston spring, 4-plunger base, 5-eccentric cam assembly, 51-eccentric cam shaft, 52-axle sleeve, 53-cam ring.
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 shown in Fig. 1 to 7, the present invention includes plunger rod 1, plunger bushing 2, piston spring 3, plunger base 4 and eccentric cam assembly 5;
Be installed with a plunger cavity 24 in plunger bushing 2, plunger rod 1 is inserted by the bottom of plunger cavity 24, and this plunger rod 1 and plunger cavity 24 Spielpassung, in order to realize plunger rod 1 sliding up and down in plunger cavity 24;
The top of plunger rod 1 is installed with the stepped deformation-compensated groove 11 of a cylinder, and bottom is fixedly connected with plunger base 4;
Piston spring 3 is set in the outer side surface of plunger rod 1, and this piston spring 3 one end is fixedly connected with plunger base 4, and the other end is fixedly connected with plunger bushing 2, in order to realize the reset of plunger rod 1;
The upper end of plunger bushing 2 is installed with the low pressure oil suction chamber 21 that is communicated with plunger cavity 24 respectively and high pressure goes out oil pocket 22, and the lower end of plunger bushing 2 is installed with the low pressure be communicated with plunger cavity 24 and unloads oil pocket 23;
Eccentric cam assembly 5 coordinates with plunger base 4 to be installed.
The bottom surface of plunger base 4 is a plane vertical with plunger rod 1.
Eccentric cam assembly 5 comprises eccentric cam shaft 51, axle sleeve 52 and cam ring 53, the center of cam ring 53 is installed with a circular mounting hole, the circular mounting hole of this cam ring 53 is set in the outside of eccentric cam shaft 51 by axle sleeve 52, the upper surface of cam ring 53 is one contact with plunger base 4 plane coordinated.
When plunger rod 1 stretches into ultimate range in plunger cavity 24, the top of this plunger rod 1 goes out the oil outlet of oil pocket 22 lower than the filler opening of low pressure oil suction chamber 21 and high pressure.
When plunger rod 1 stretches into ultimate range in plunger cavity 24, piston spring 3 is in compressive state.
The stepped central axis of deformation-compensated groove 11 of cylinder and the central axes of plunger rod 1.
The central axis of plunger rod 1 and the central axes of piston spring 3.
Eccentric cam shaft 51 and axle sleeve 52 interference fit.
Working procedure of the present invention is: suppose that the plunger rod 1 of high pressure variable displacement pump is in outside contraction state in plunger cavity 24;
Low pressure oil suction chamber 21 provides low-voltage fuel to plunger cavity 24, and this low-voltage fuel enters in the stepped deformation-compensated groove 11 of cylinder simultaneously;
Eccentric cam shaft 51 rotates, and under the contact of plunger base 4 coordinates, drives cam ring 53 to move upward, and then drives plunger base 4 to move upward, plunger rod 1 is stretched in plunger cavity 25, increase plunger cavity 24 internal combustion oil pressure strong;
High pressure fuel now in the stepped deformation-compensated groove 11 of cylinder makes plunger rod 1 radial deformation, and the Spielpassung sealing surface sealability between plunger rod 1 and plunger cavity 24 inwall increases;
High pressure fuel goes out oil pocket 22 by high pressure and exports;
Eccentric cam shaft 51 is rotated further, under the contact of plunger base 4 coordinates, drive cam ring 53 to move downward, plunger base 4 coordinates cam ring 53 to move downward under the effect of piston spring 3, make plunger rod 1 be in outside contraction state in plunger cavity 24, the process that repeats works on.
A stepped deformation-compensated groove 11 of cylinder is processed on plunger rod 1 top, be full of therebetween by introducing high pressure fuel, produce certain radial deformation, the distortion had along with fuel pressure and plunger bushing due to this radial deformation increases and the feature of increase, make the matching gap of couple can remain on an appropriate number range, thus realize the dynamic seal (packing) of the plunger coupled parts of not clamping stagnation condition, realize the favorable sealing property of plunger coupled parts in full range of working pressure and power performance is stablized, meet the job requirement of superpressure oil pump.
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 (8)
1. a deformable compensation high pressure variable pump plunger, is characterized in that: comprise plunger rod, plunger bushing, piston spring, plunger base and eccentric cam assembly;
Be installed with a plunger cavity in described plunger bushing, described plunger rod is inserted by the bottom of described plunger cavity, and this plunger rod and described plunger cavity Spielpassung;
The top of described plunger rod is installed with the stepped deformation-compensated groove of a cylinder, and bottom is fixedly connected with described plunger base;
Described piston spring is set in the outer side surface of described plunger rod, and this piston spring one end is fixedly connected with described plunger base, and the other end is fixedly connected with described plunger bushing;
The upper end of described plunger bushing is installed with the low pressure oil suction chamber that is communicated with described plunger cavity respectively and high pressure goes out oil pocket, and the lower end of described plunger bushing is installed with the low pressure be communicated with described plunger cavity and unloads oil pocket;
Described eccentric cam assembly and described plunger base engagement are installed.
2. deformable according to claim 1 compensation high pressure variable pump plunger, is characterized in that: the bottom surface of described plunger base is a plane vertical with plunger rod.
3. deformable according to claim 2 compensation high pressure variable pump plunger, it is characterized in that: described eccentric cam assembly comprises eccentric cam shaft, axle sleeve and cam ring, described cam Ring current distribution is installed with a circular mounting hole, the circular mounting hole of this cam ring is set in the outside of described eccentric cam shaft by axle sleeve, the upper surface of described cam ring is a plane coordinated with described plunger base contacts.
4. deformable according to claim 1 compensation high pressure variable pump plunger, it is characterized in that: when described plunger rod stretches into ultimate range in described plunger cavity, the top of this plunger rod goes out the oil outlet of oil pocket lower than the filler opening of described low pressure oil suction chamber and high pressure.
5. deformable according to claim 1 compensation high pressure variable pump plunger, is characterized in that: when described plunger rod stretches into ultimate range in described plunger cavity, piston spring is in compressive state.
6. deformable according to claim 1 compensation high pressure variable pump plunger, is characterized in that: the central axis of the stepped deformation-compensated groove of described cylinder and the central axes of described plunger rod.
7. deformable according to claim 1 compensation high pressure variable pump plunger, is characterized in that: the central axis of described plunger rod and the central axes of described piston spring.
8. deformable according to claim 3 compensation high pressure variable pump plunger, is characterized in that: described eccentric cam shaft and described axle sleeve interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510932411.9A CN105370465A (en) | 2015-12-11 | 2015-12-11 | Deformable compensation type high-pressure variable pump plunger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510932411.9A CN105370465A (en) | 2015-12-11 | 2015-12-11 | Deformable compensation type high-pressure variable pump plunger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105370465A true CN105370465A (en) | 2016-03-02 |
Family
ID=55372989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510932411.9A Pending CN105370465A (en) | 2015-12-11 | 2015-12-11 | Deformable compensation type high-pressure variable pump plunger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105370465A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611251A (en) * | 2018-10-30 | 2019-04-12 | 中国北方发动机研究所(天津) | A kind of seat ring Split high pressure cam of injection pump axis |
Citations (7)
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|---|---|---|---|---|
| CN2230362Y (en) * | 1995-05-02 | 1996-07-03 | 毕晴春 | Coupling device for side-pressure sealed piston |
| CN2497071Y (en) * | 2001-10-19 | 2002-06-26 | 重庆红江机械厂 | Monoblock fuel-injection pump for diesel engine |
| DE102008010242A1 (en) * | 2008-02-21 | 2009-08-27 | Robert Bosch Gmbh | High pressure generator for use in e.g. fuel injection system in diesel engine, has piston interfused by cross hole in transverse direction, where hole opens into groove at end turned towards chamber and is connected to piston front surface |
| CN101555849A (en) * | 2008-04-09 | 2009-10-14 | 欧阳光耀 | Deformation compensation technology of high-pressure fuel pump of diesel engine |
| CN103026048A (en) * | 2010-07-27 | 2013-04-03 | 罗伯特·博世有限公司 | High pressure pump |
| CN103703247A (en) * | 2011-06-02 | 2014-04-02 | 德尔福技术控股有限公司 | Improvements to fuel pumps |
| DE102013204355A1 (en) * | 2013-03-13 | 2014-09-18 | Robert Bosch Gmbh | Pump, in particular fuel pump for an internal combustion engine |
-
2015
- 2015-12-11 CN CN201510932411.9A patent/CN105370465A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2230362Y (en) * | 1995-05-02 | 1996-07-03 | 毕晴春 | Coupling device for side-pressure sealed piston |
| CN2497071Y (en) * | 2001-10-19 | 2002-06-26 | 重庆红江机械厂 | Monoblock fuel-injection pump for diesel engine |
| DE102008010242A1 (en) * | 2008-02-21 | 2009-08-27 | Robert Bosch Gmbh | High pressure generator for use in e.g. fuel injection system in diesel engine, has piston interfused by cross hole in transverse direction, where hole opens into groove at end turned towards chamber and is connected to piston front surface |
| CN101555849A (en) * | 2008-04-09 | 2009-10-14 | 欧阳光耀 | Deformation compensation technology of high-pressure fuel pump of diesel engine |
| CN103026048A (en) * | 2010-07-27 | 2013-04-03 | 罗伯特·博世有限公司 | High pressure pump |
| CN103703247A (en) * | 2011-06-02 | 2014-04-02 | 德尔福技术控股有限公司 | Improvements to fuel pumps |
| DE102013204355A1 (en) * | 2013-03-13 | 2014-09-18 | Robert Bosch Gmbh | Pump, in particular fuel pump for an internal combustion engine |
Non-Patent Citations (1)
| Title |
|---|
| 吴欣颖等: "电控共轨高压油泵柱塞偶件设计及试验研究", 《内燃机学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611251A (en) * | 2018-10-30 | 2019-04-12 | 中国北方发动机研究所(天津) | A kind of seat ring Split high pressure cam of injection pump axis |
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Application publication date: 20160302 |
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