CN202579169U - Cycloidal fuel delivery pump of high-pressure common rail fuel injection system - Google Patents
Cycloidal fuel delivery pump of high-pressure common rail fuel injection system Download PDFInfo
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- CN202579169U CN202579169U CN 201220241023 CN201220241023U CN202579169U CN 202579169 U CN202579169 U CN 202579169U CN 201220241023 CN201220241023 CN 201220241023 CN 201220241023 U CN201220241023 U CN 201220241023U CN 202579169 U CN202579169 U CN 202579169U
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- pump housing
- fuel
- inner chamber
- fuel supply
- rotor
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- 239000000446 fuel Substances 0.000 title claims abstract description 96
- 238000002347 injection Methods 0.000 title claims abstract description 19
- 239000007924 injection Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000004663 powder metallurgy Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000010349 pulsation Effects 0.000 abstract description 3
- 241001272720 Medialuna californiensis Species 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 60
- 239000000295 fuel oil Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model belongs to the technical field of automobile parts, and particularly discloses a cycloidal fuel delivery pump of a high-pressure common rail fuel injection system, which consists of a fuel delivery pump body, an outer rotor, an inner rotor and a cross joint, wherein the fuel delivery pump is an integral structure; an inner rotor shaft and a pump body inner cavity are eccentrically and vertically arranged on the bottom surface of the inner cavity of the pump body by taking the radius of the central circle of the inner rotor shaft on the bottom surface of the inner cavity of the pump body as the symmetric axis; the low-pressure fuel cavity and the high-pressure fuel cavity of a half-moon shaped groove are symmetrically arranged on the bottom surface of the inner cavity of the pump body, the low-pressure fuel cavity is on the right side, and the fuel inlet at the lower end of the bottom surface of the low-pressure fuel cavity is communicated with the fuel intake joint on the back of the fuel delivery pump; and the inner rotors and the outer rotors with the gear petal structures are formed into a pair of eccentric internal engaged rotors. By adopting the integrally-structured pump body and axial fuel intake, the structure is compact, the size is small, and possibility of forming cavitation is low; as the gears are engaged during the working and circulating processes of the inner and outer rotors, the operation is stable, the pulsation is small, the noise is low, and the volumetric efficiency is high; therefore, the cycloidal fuel delivery pump of the high-pressure common rail fuel injection system is applicable to the diesel engine fuel injection system of the automobile.
Description
Technical field
The utility model belongs to technical field of automobile parts, the cycloid oil transfer pump in particularly a kind of high pressure common rail fuel injection system.
Background technique
Start the not enough problem of fuel feeding during automotive Diesel engine ubiquity low temperature low speed, can not be suitable for the needs of high pressure fuel system, the oil transfer pump of the mechanical type injection system that adopts at present; Comprise vane pump, gear pump and plunger pump; All exist pressure and flow pulse big, noise is high, and volumetric efficiency is low; Defectives such as low speed oil absorption difference cause the domestic automobile emissions of diesel engines not reach Europe III even Europe IV, the Europe V standard of international requirement.
Cycloid rotor pump be in recent years in low-voltage high speed pump field by the pattern of extensively praising highly, early stage because inner and outer rotors needs expensive rotor grinding machine difficult processing to be promoted.But along with the development of domestic means of a powder metallurgy technique, manufacturing process is resolved, and domestic oil pump industry has also almost all adopted cycloid rotor pump on monoblock pump; But existing cycloid rotor pump adopts the pump housing that divides body structure and from pump housing inside via mode, so the volume of pump is big, galloping; Pulsation is big; Noise is big, is prone to the aerogenesis cave, and volumetric efficiency is low.For addressing the above problem, need a kind of pump housing to be structure as a whole the cycloid oil transfer pump of axial fuel inlet from pump housing bottom surface.
The model utility content
The volume that the purpose of the utility model is to solve the described pump of background technique is big, galloping, and pulsation is big; Noise is big, is prone to the aerogenesis cave, and volumetric efficiency is hanged down problem; Cycloid in a kind of high pressure common rail fuel injection system oil transfer pump is provided; Cycloid oil transfer pump in the high pressure common rail fuel injection system is made up of fuel supply pump housing 1, external rotor 2, internal rotor 3 and cross joint 4, and external rotor 2 places in the pump housing inner chamber 101 of fuel supply pump housing 1, internal rotor 3 in external rotor 2 and the inner rotor shaft 102 of fuel supply pump housing 1 be rotationally connected; Cross joint 4 places in the cross joint mounting groove 303 of internal rotor 3; It is characterized in that fuel supply pump housing 1 is the integrative-structure that comprises pump housing inner chamber 101, inner rotor shaft 102, low pressure oil pocket 103, high-voltage oil cavity 104, oil inlet hole 105, fuel inlet fitting 106, fixed hole 107 and seal groove 108, in the pump housing inner chamber 101 of circle; Inner rotor shaft 102 and pump housing inner chamber 101 be eccentric and vertical to be placed on the bottom surface of pump housing inner chamber 101, and the center of circle of pump housing inner chamber 101 bottom surfaces is O
1, the center of circle of inner rotor shaft 102 on pump housing inner chamber 101 bottom surfaces is O
2, through O
2Pump housing inner chamber 101 bottom surface radius O
1The length of A is r, O
2Depart from O
1Distance be d, with pump housing inner chamber 101 bottom surface radius O
1A is a symmetry axis, and 2 half-moon-shaped grooves are symmetrically placed on pump housing inner chamber 101 bottom surfaces radius O
1The groove in A left side is a high-voltage oil cavity 104; The groove on right side is a low pressure oil pocket 103; Oil inlet hole 105 is built in the lower end of low pressure oil pocket 103 bottom surfaces at low pressure oil pocket 103, and oil inlet hole 105 is for penetrating the circular hole of fuel supply pump housing 1 bottom, and fuel inlet fitting 106 places the back side of fuel supply pump housing 1; The intracavity bottom of fuel inlet fitting 106 is communicated with oil inlet hole 105; The internal chamber wall of fuel inlet fitting 106 is a worm structure, and the seal groove 108 of ring places on fuel supply pump housing 1 front surface, and 3 fixed holes 107 are spacedly distributed on fuel supply pump housing 1 by the rotation symmetry;
Said O
2Depart from O
1Be 8～10% of pump housing inner chamber 101 bottom surface radius r apart from d;
Said fuel supply pump housing 1 adopts means of a powder metallurgy technique processing;
The structure of said external rotor 2 does, external rotor outer wall 201 is the cylndrical surface, and external rotor outer wall 201 is a Spielpassung with the inwall of pump housing inner chamber 101, and external rotor inwall 202 is rotational symmetric seven lobe profile of tooth cylinders; The structure of said internal rotor 3 does, internal rotor outer wall 301 is rotational symmetric six lobe profile of tooth cylinders, and the center of internal rotor 3 is circular internal rotor axis hole 302, cross the joint mounting groove 303 and the internal rotor axis hole 302 concentric fronts that place internal rotor 3 of cydariform; The cross joint 4 of cydariform places in the cross joint mounting groove 303 of internal rotor 3; Cross joint 4 is through camshaft attachment hole 401 camshaft 5 connections of rail pump together at center; In external rotor 2; Internal rotor 3 is rotationally connected through the inner rotor shaft 102 of internal rotor axis hole 302 with fuel supply pump housing 1, and the internally meshed rotors of external rotor 2 and internal rotor 3 mutual off-centre a pair of off-centre of formation in the pump housing inner chamber 101 of fuel supply pump housing 1 are as the operation element that produces oil pressure; The front surface of external rotor 2 and internal rotor 3 is lower than fuel supply pump housing 1 front surface 0.03mm～0.07mm; Oil transfer pump is when work; Under the driving of camshaft 5, internal rotor 3 is a power rotor, and external rotor 2 is a driven rotor; Internal rotor 3 turns clockwise with external rotor 2 in the same way, passes through the eccentric each other interior engagement of tooth lobe between internal rotor outer wall 301 and the external rotor inwall 202.
External rotor 2 all adopts means of a powder metallurgy technique processing with internal rotor 3.
The beneficial effect of the utility model does, fuel supply pump housing is structure as a whole, and oil inlet hole places pump housing bottom surface, axial fuel inlet, and compact structure, volume are little, are difficult for the aerogenesis cave; External rotor and internal rotor are the eccentric internal gearing structure of seven lobe profile of tooth cylinders and six lobe profile of tooth cylinders, and internal rotor center and external rotor misalignment are little, and inner and outer rotors rotates in the same way; Between cog forms independently oil pocket; The between cog of internal rotor and external rotor keeps being meshing with each other in the work cycle process, and therefore running is steady, and it is little to pulse; Noise is low, and volumetric efficiency is high.
Description of drawings
Fig. 1 is the cycloid oil transfer pump structural representation in the high pressure common rail fuel injection system;
Fig. 2 is the fuel supply pump housing perspective view;
Fig. 3 is the fuel supply pump housing left view;
Fig. 4 is a B-B place sectional view among Fig. 3;
Fig. 5 is the external rotor plan view;
Fig. 6 is the internal rotor plan view;
Fig. 7 is cross joint plan view;
Fig. 8 is used for the scheme of installation of high pressure common rail fuel injection system for the cycloid oil transfer pump.
Among the figure, 1--fuel supply pump housing, 2--external rotor, 3--internal rotor, 4--cross joint; The 5--camshaft, 6--is the rail pump housing altogether, 7--oil transfer pump fastening screw trip bolt, 8--low pressure fuel pipe tee union, 9--O type circle; 101--pump housing inner chamber, 102--inner rotor shaft, 103--low pressure oil pocket, 104--high-voltage oil cavity, 105--oil inlet hole; The 106--fuel inlet fitting, 107--fixed hole, 108--seal groove, 201--external rotor outer wall, 202--external rotor inwall; 301--internal rotor outer wall, 302--internal rotor axis hole, 303--cross joint mounting groove, 401--camshaft attachment hole.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is further described.
Fig. 1 is the cycloid oil transfer pump example structure schematic representation in the high pressure common rail fuel injection system; Cycloid oil transfer pump in the high pressure common rail fuel injection system is made up of fuel supply pump housing 1, external rotor 2, internal rotor 3 and cross joint 4; External rotor 2 places in the pump housing inner chamber 101 of fuel supply pump housing 1; Internal rotor 3 is rotationally connected with the inner rotor shaft 102 of fuel supply pump housing 1 in external rotor 2, and cross joint 4 places in the cross joint mounting groove 303 of internal rotor 3.
Like Fig. 2, Fig. 3 and fuel supply pump housing structural drawing shown in Figure 4; Fuel supply pump housing 1 comprises pump housing inner chamber 101, inner rotor shaft 102, low pressure oil pocket 103, high-voltage oil cavity 104, oil inlet hole 105, fuel inlet fitting 106, fixed hole 107 and seal groove 108, and fuel supply pump housing 1 is the integrative-structure of means of a powder metallurgy technique processing.In the pump housing inner chamber 101 of circle, inner rotor shaft 102 is vertical with pump housing inner chamber 101 off-centre to be placed on the bottom surface of pump housing inner chamber 101, and the center of circle of pump housing inner chamber 101 bottom surfaces is O
1, the center of circle of inner rotor shaft 102 on pump housing inner chamber 101 bottom surfaces is O
2, through O
2Pump housing inner chamber 101 bottom surface radius O
1The length of A is r, O
2Depart from O
1Distance be d, the r of present embodiment is 22.5mm, d is 2.2mm.With pump housing inner chamber 101 bottom surface radius O
1A is a symmetry axis, and 2 half-moon-shaped grooves are symmetrically placed on pump housing inner chamber 101 bottom surfaces.Radius O
1The groove in A left side is a high-voltage oil cavity 104, and the groove on right side is a low pressure oil pocket 103.Oil inlet hole 105 is built in the lower end of low pressure oil pocket 103 bottom surfaces at low pressure oil pocket 103.Oil inlet hole 105 is the circular hole that penetrates the bottom of fuel supply pump housing 1, and fuel inlet fitting 106 places the back side of fuel supply pump housing 1, and the intracavity bottom of fuel inlet fitting 106 is communicated with oil inlet hole 105, and the internal chamber wall of fuel inlet fitting 106 is a worm structure.The seal groove 108 of ring places on fuel supply pump housing 1 front surface, and 3 fixed holes 107 are spacedly distributed on fuel supply pump housing 1 by the rotation symmetry.
The structure of external rotor 2 does, external rotor outer wall 201 is the cylndrical surface, and external rotor outer wall 201 is a Spielpassung with the inwall of pump housing inner chamber 101, and internal rotor outer wall 301 is rotational symmetric seven lobe profile of tooth cylinders, and is as shown in Figure 5.The structure of internal rotor 3 does, internal rotor outer wall 301 is rotational symmetric six lobe profile of tooth cylinders, and the center of internal rotor 3 is circular internal rotor axis hole 302, and cross the joint mounting groove 303 and the internal rotor axis hole 302 concentric fronts that place internal rotor 3 of cydariform are as shown in Figure 6.The cross joint 4 of cydariform shown in Figure 7 places in the cross joint mounting groove 303 of internal rotor 3, and cross joint 4 is through camshaft attachment hole 401 camshaft 5 connections of rail pump together at center.
In external rotor 2; Internal rotor 3 is rotationally connected through the inner rotor shaft 102 of internal rotor axis hole 302 with fuel supply pump housing 1, and the internally meshed rotors of external rotor 2 and internal rotor 3 mutual off-centre a pair of off-centre of formation in the pump housing inner chamber 101 of fuel supply pump housing 1 are as the operation element that produces oil pressure; Oil transfer pump is when work, and under the driving of camshaft 5, internal rotor 3 is a power rotor, and external rotor 2 is a driven rotor, and internal rotor 3 turns clockwise with external rotor 2 in the same way, passes through engagement in the mutual off-centre of tooth lobe between internal rotor outer wall 301 and the external rotor inwall 202
Fig. 8 is used for the scheme of installation of high pressure common rail fuel injection system for the cycloid oil transfer pump.The cycloid oil transfer pump has assembled external rotor 2, internal rotor 3 and cross joint 4 backs and with oil transfer pump fastening screw trip bolt 7 the cycloid oil transfer pump has been fastened on the common rail pump housing 6 in fuel supply pump housing 1; The common rail pump oil inlet hole that pump housing inner chamber 101 will be total on the rail pump housing 6 covers; The front surface of external rotor 2 and internal rotor 3 is lower than fuel supply pump housing 1 front surface 0.05mm; O type circle 9 places in the seal groove 108 of fuel supply pump housing 1 and seals; Guaranteeing that fuel oil does not produce leaks, and the camshaft attachment hole 401 of the camshaft 5 of rail pump through the center saves 4 with cross and be connected altogether.Low pressure fuel pipe tee union 8 is fixed on the fuel inlet fitting 106 through being threaded, and the cycloid oil transfer pump is communicated with fuel tank.
The working principle of the utility model is that camshaft 5 rotates, and drives internal rotor 3 rotations through cross joint 4; Internal rotor 3 is a power rotor, and external rotor 2 is a driven rotor, the eccentric each other engagement of the tooth lobe of internal rotor 3 and external rotor 2; Turn clockwise in the same way, be full of low pressure oil pocket 103 to fuel from fuel tank inspiration low pressure fuel pipe tee union 8 through oil inlet hole 105, internal rotor 3 forms the several separate oil pocket with external rotor 2 in the engagement rotation process; Along with the engagement rotation of inner and outer rotors, the volume of each oil pocket will change, and will be maximum at the oil pocket volume corresponding to low pressure oil pocket 103 positions; The inspiration fuel oil, minimum at oil pocket volume corresponding to high-voltage oil cavity 104 positions, discharge fuel oil with certain pressure; The circulation engagement like this of each tooth lobe of inner and outer rotors has formed suction oil process, to being total to the rail pump fuel oil is provided.Different with the cycloid oil transfer pump of existing technology is; The utility model has adopted the integrative-structure fuel supply pump housing of means of a powder metallurgy technique processing; The oil-feed mode is the oil inlet hole axial fuel inlet from the low pressure oil pocket bottom surface of fuel supply pump housing, and whole oil transfer pump compact structure, volume are little, are difficult for the aerogenesis cave; The between cog of internal rotor and external rotor keeps being meshing with each other in the work cycle process, and therefore running is steady, and it is little to pulse, and noise is low, and volumetric efficiency is high.
The utility model has guaranteed that fuel oil circulates in the low pressure oil-way system, and to the fuel oil of enough flows of high-pressure injection pump supply and certain pressure, can improve the energy-saving and emission-reduction and the combination property level of the homemade diesel engine of China.The utility model is applicable to the injecting fuel of diesel motor system of automobile.
Claims (3)
1. the cycloid oil transfer pump in the high pressure common rail fuel injection system; Cycloid oil transfer pump in the high pressure common rail fuel injection system is made up of fuel supply pump housing (1), external rotor (2), internal rotor (3) and cross joint (4); External rotor (2) places in the pump housing inner chamber (101) of fuel supply pump housing (1); Internal rotor (3) is rotationally connected with the inner rotor shaft (102) of fuel supply pump housing (1) in external rotor (2); Cross joint (4) places in the cross joint mounting groove (303) of internal rotor (3); It is characterized in that fuel supply pump housing (1) is the integrative-structure that comprises pump housing inner chamber (101), inner rotor shaft (102), low pressure oil pocket (103), high-voltage oil cavity (104), oil inlet hole (105), fuel inlet fitting (106), fixed hole (107) and seal groove (108), in the pump housing inner chamber (101) of circle; Inner rotor shaft (102) and pump housing inner chamber (101) be eccentric and vertical to be placed on the bottom surface of pump housing inner chamber (101), and the center of circle of pump housing inner chamber (101) bottom surface is O
1, the center of circle of inner rotor shaft (102) on pump housing inner chamber (101) bottom surface is O
2, through O
2Pump housing inner chamber (101) bottom surface radius O
1The length of A is r, O
2Depart from O
1Distance be d, with pump housing inner chamber (101) bottom surface radius O
1A is a symmetry axis, and 2 half-moon-shaped grooves are symmetrically placed on pump housing inner chamber (101) bottom surface radius O
1The groove in A left side is high-voltage oil cavity (104); The groove on right side is low pressure oil pocket (103); Oil inlet hole (105) is built in the lower end of low pressure oil pocket (103) bottom surface at low pressure oil pocket (103), and oil inlet hole (105) is for penetrating the circular hole bottom the fuel supply pump housing (1), and fuel inlet fitting (106) places the back side of fuel supply pump housing (1); The intracavity bottom of fuel inlet fitting (106) is communicated with oil inlet hole (105); The internal chamber wall of fuel inlet fitting (106) is a worm structure, and the seal groove of ring (108) places on fuel supply pump housing (1) front surface, and 3 fixed holes (107) are spacedly distributed on fuel supply pump housing (1) by the rotation symmetry.
2. the cycloid oil transfer pump in a kind of high pressure common rail fuel injection system according to claim 1 is characterized in that, said O
2Depart from O
1Be 8～10% of pump housing inner chamber (101) bottom surface radius r apart from d.
3. the cycloid oil transfer pump in a kind of high pressure common rail fuel injection system according to claim 1 is characterized in that, said fuel supply pump housing (1) adopts means of a powder metallurgy technique processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220241023 CN202579169U (en) | 2012-05-28 | 2012-05-28 | Cycloidal fuel delivery pump of high-pressure common rail fuel injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220241023 CN202579169U (en) | 2012-05-28 | 2012-05-28 | Cycloidal fuel delivery pump of high-pressure common rail fuel injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202579169U true CN202579169U (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220241023 Expired - Lifetime CN202579169U (en) | 2012-05-28 | 2012-05-28 | Cycloidal fuel delivery pump of high-pressure common rail fuel injection system |
Country Status (1)
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| CN (1) | CN202579169U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105247218A (en) * | 2013-04-11 | 2016-01-13 | 卡特彼勒公司 | Gear pump having grooved mounting adapter |
| CN107664067A (en) * | 2016-07-29 | 2018-02-06 | 常柴股份有限公司 | Single cylinder common rail diesel engine |
| CN108533431A (en) * | 2018-05-29 | 2018-09-14 | 象山申达轿车配件厂 | A kind of engine idling start stop system oil pump |
| CN110701042A (en) * | 2019-11-06 | 2020-01-17 | 绵阳富临精工机械股份有限公司 | Electronic oil pump transmission structure |
| CN113503216A (en) * | 2021-08-25 | 2021-10-15 | 一汽解放汽车有限公司 | Diesel engine fuel supply system and testing method thereof |
-
2012
- 2012-05-28 CN CN 201220241023 patent/CN202579169U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105247218A (en) * | 2013-04-11 | 2016-01-13 | 卡特彼勒公司 | Gear pump having grooved mounting adapter |
| CN107664067A (en) * | 2016-07-29 | 2018-02-06 | 常柴股份有限公司 | Single cylinder common rail diesel engine |
| CN108533431A (en) * | 2018-05-29 | 2018-09-14 | 象山申达轿车配件厂 | A kind of engine idling start stop system oil pump |
| CN110701042A (en) * | 2019-11-06 | 2020-01-17 | 绵阳富临精工机械股份有限公司 | Electronic oil pump transmission structure |
| CN110701042B (en) * | 2019-11-06 | 2024-03-01 | 四川芯智热控技术有限公司 | Electronic oil pump transmission structure |
| CN113503216A (en) * | 2021-08-25 | 2021-10-15 | 一汽解放汽车有限公司 | Diesel engine fuel supply system and testing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121205 |
|
| CX01 | Expiry of patent term |