CN103946534B - Fuel-injection pump and internal combustion engine - Google Patents
Fuel-injection pump and internal combustion engine Download PDFInfo
- Publication number
- CN103946534B CN103946534B CN201380003996.5A CN201380003996A CN103946534B CN 103946534 B CN103946534 B CN 103946534B CN 201380003996 A CN201380003996 A CN 201380003996A CN 103946534 B CN103946534 B CN 103946534B
- Authority
- CN
- China
- Prior art keywords
- fuel
- plunger barrel
- valve seat
- outer peripheral
- injection pump
- Prior art date
- 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.)
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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
- F02M59/44—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
- F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The present invention provides the deterioration of a kind of sealing ring being prevented from and being located between axle portion outer peripheral face and the inner peripheral surface of plunger barrel of conveying valve seat, and improves the fuel-injection pump of the durability of sealing ring.Outer peripheral face in the upper end of plunger barrel (5) is provided with the cross-drilled hole (25) connected in the gap in recess (21) and between outer peripheral face and the inner peripheral surface of described plunger barrel (5) in the axle portion (4a) being formed at conveying valve seat (4).
Description
Technical field
The present invention relates to the fuel-injection pump to internal combustion engine injection fuel such as diesel engines.
Background technology
As the fuel-injection pump to the internal combustion engine such as diesel engine injection fuel, it is known to plunger barrel relative to
Pump case is fixed, and increases and decreases the fuel-injection pump of fuel injection amount relative to plunger barrel by making plunger rotate
(referring for example to patent documentation 1).
Citation
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2003-301760 publication
Summary of the invention
The problem that invention is to be solved
It addition, in recent years, propose to have following fuel-injection pump: plunger barrel can relative to pump case and
The conveying valve seat possessing transfer valve carries out relative movement, by making plunger barrel relative to pump case and transfer valve
Seat carries out relative movement and can change (adjustment) fuel and spray opportunity.
But, in such fuel-injection pump, at the axle portion outer peripheral face of conveying valve seat and along conveying
It is provided with sealing ring (O type between the inner peripheral surface of the plunger barrel that the axle portion outer peripheral face of valve seat moves in the axial direction
Ring), by a part for the fuel of the high pressure of the end face jack-up of plunger by carrying the periphery, axle portion of valve seat
(small) gap between face and the inner peripheral surface of plunger barrel and arrive sealing ring, exist and make sealing ring
Deteriorate such problem points.
The present invention proposes in view of the foregoing, its object is to provide one to be prevented from being located at conveying
The deterioration of the sealing ring between axle portion outer peripheral face and the inner peripheral surface of plunger barrel of valve seat and raising sealing ring
The fuel-injection pump of durability and internal combustion engine.
For solving the scheme of problem
The fuel-injection pump of the present invention possesses: pump case, and it is provided with fuel suction port in side；Plunger barrel,
It is housed in described pump case, axially moves back and forth in described pump case；Conveying valve seat, its tool
The standby axle portion being housed in working cylinder, and by inaccessible for the opening being positioned at upper end of described pump case, this work
Cylinder is axially arranged in the inside of described plunger barrel；Plunger, its in described working cylinder axially
Moving back and forth, described fuel-injection pump is configured to, and is flowed in described pump case from described fuel suction port
Fuel via in the outer peripheral face of the first half at described plunger barrel and the described pump case opposed with it
The recess formed between side face, and be directed to be positioned at described plunger from the suction inlet being located at described plunger barrel
End face and described conveying valve seat described axle portion lower surface between described working cylinder in, by described
The end face jack-up of plunger and become the fuel of high pressure, wherein, in the periphery of the upper end of described plunger barrel
Face be provided with by described recess be formed at the outer peripheral face in described axle portion of described conveying valve seat and described
The cross-drilled hole of the gap connection between the inner peripheral surface of plunger barrel.
According to the fuel-injection pump of the present invention, by the axle portion outer peripheral face of conveying valve seat with in plunger barrel
(small) gap between side face and move to the fuel of the high pressure of sealing ring (o-ring) side and exist
It is directed in recess via cross-drilled hole before arriving sealing ring.
Thereby, it is possible to prevent from being located between axle portion outer peripheral face and the inner peripheral surface of plunger barrel carrying valve seat
The deterioration of sealing ring, improves the durability of sealing ring, thus realizes the long life of maintenance cycle.
In above-mentioned fuel-injection pump, it is preferred that described cross-drilled hole be positioned at opening outside radial direction
Mouth is arranged at the leading section, axle portion to the location screw on the outer peripheral face being arranged on described pump case and receives
The bottom surface of the pod held.
According to such fuel-injection pump, pod serves as a part for cross-drilled hole, therefore, it is possible to shorten horizontal stroke
The length in hole, reduces the pressure loss in cross-drilled hole, makes more suitable to the flowing of the fuel in recess from cross-drilled hole
Freely.
In above-mentioned fuel-injection pump, it is preferred that when described plunger barrel is positioned at the top
, between outer peripheral face and the inner peripheral surface of described plunger barrel than the described axle portion being located at described conveying valve seat
Sealing ring on the lower and closest to the position of described sealing ring, be provided with described cross-drilled hole is positioned at half
Opening inside direction, footpath.
According to such fuel-injection pump, to outer peripheral face and the inner circumferential of plunger barrel in the axle portion of conveying valve seat
Between face, the fuel of supply plays the effect as lubricant.Therefore, it is possible to make plunger barrel the most suitable
Freely mobile, it is possible to reduce the outer peripheral face in the axle portion of conveying valve seat and the abrasion of the inner peripheral surface of plunger barrel
Amount.
The internal combustion engine of the present invention possesses above-mentioned fuel-injection pump.
The internal combustion engine of the present invention possesses the axle portion outer peripheral face and plunger barrel being prevented from being located at conveying valve seat
Inner peripheral surface between sealing ring deterioration, improve the durability of sealing ring and realize the length of maintenance cycle
The fuel-injection pump of phase.Internal combustion engine is made to stop fortune because safeguarding fuel-injection pump therefore, it is possible to reduce
The frequency turned, it is possible to increase the reliability of internal combustion engine.
It addition, according to the internal combustion engine of the present invention, by axle portion outer peripheral face and the plunger barrel of conveying valve seat
(small) gap between inner peripheral surface and move to the fuel of the high pressure of sealing ring (o-ring) side
It is directed in recess via cross-drilled hole between sealing ring arriving, is directed to from the suction inlet being located at plunger barrel
Plunger end face and conveying valve seat axle portion lower surface between working cylinder in, as fuel quilt
Utilize.
Thereby, it is possible to utilize the combustion discharged outside system as thing of releasing in prior art the most lavishly
Material, thus improve fuel availability.
Invention effect
Fuel-injection pump according to the present invention, it is possible to prevent from being located at axle portion outer peripheral face and the post of conveying valve seat
The deterioration of the sealing ring between the inner peripheral surface of plug tube, improves the durability of sealing ring.
Accompanying drawing explanation
Fig. 1 is the longitudinal sectional view of the fuel-injection pump of one embodiment of the present invention.
Fig. 2 is that the II-II of Fig. 1 is to regarding sectional view.
Detailed description of the invention
Hereinafter, with reference to Fig. 1 and Fig. 2, the fuel-injection pump of one embodiment of the present invention is said
Bright.
As shown in Figure 1 or 2, the fuel-injection pump 1 of present embodiment possess pump case 2, plunger 3,
Conveying valve seat 4 and plunger barrel 5.
Pump case 2 is the housing housing plunger barrel 5 in inside, be positioned at the opening of its one end (upper end) by
Conveying valve seat 4 is inaccessible.
Plunger 3 is the pole shape that axially (above-below direction in figure) slides in working cylinder 11
Component, and on its top peripheral face, be provided with reed (not shown), wherein, described working cylinder 11
Axially it is arranged on the inside of plunger barrel 5.The bottom surface 3a of plunger 3 with by cam (not shown)
And the fuel pump driving device moved up and down (not shown) connect, plunger 3 along with cam rotation and
Move back and forth vertically in the working cylinder 11 being located at plunger barrel 5.
Conveying valve seat 4 is provided with a stream 12 at axially inside (above-below direction in figure), is setting
Transfer valve 14 is contained in the recess 13 of the export department of stream 12.
It should be noted that the symbol 15 in figure represent to transfer valve 14 to the entrance side of stream 12,
The i.e. transfer valve spring of plunger 3 side force.
Plunger barrel 5 in inside axially (above-below direction in figure) be provided with a working cylinder 11.?
The working cylinder 11 being positioned at plunger 3 side houses plunger 3, at the working cylinder being positioned at transfer valve seat 4 side
The axle portion 4a of conveying valve seat 4 is housed in 11.It addition, in one and half portions (first half) of plunger barrel 5
Outer peripheral face and the inner peripheral surface of the pump case 2 opposed with it between be circumferentially provided with formed at long-pending oil recessed
Portion (space) 21.Central part at plunger barrel 5 separates 180 degree be interval with and working cylinder 11
In and recess 21 in the suction inlet 22 of connection.
The outer peripheral face of the one end (upper end) of plunger barrel 5 separates 180 degree be interval with vertical
Groove 24, this pod 24 is for housing the axle portion of the location screw 23 being installed on the outer peripheral face of pump case 2
Leading section.It addition, in the bottom surface of pod 24 is provided with pod 24 be formed in working cylinder 11
(more specifically, it is formed at the axle portion 4a outer peripheral face of conveying valve seat 4 and the inner peripheral surface of plunger barrel 5
Between) (small) gap connection cross-drilled hole 25.
It should be noted that the symbol 31 in figure represents the axle being circumferentially arranged on conveying valve seat 4
Circumferential slot (annular groove) on portion's 4a outer peripheral face.Symbol 32 expression is housed in the sealing in circumferential slot 31
Ring (o-ring).Symbol 33 represents the regulating sleeve making plunger 3 rotate around axis.Symbol 34
Represent the timing sleeve making plunger barrel 5 move in the axial direction.
It addition, separate the interval of 180 degree from the two sides at the one end (upper end) of pump case 2
The fuel that the fuel suction port 41 arranged flows in pump case 2 passes through recess 21, and from suction inlet 22
To the working cylinder 11 between the end face 3b and the axle subordinate end face 4b of conveying valve seat 4 of plunger 3
Interior inflow, by end face 3b jack-up (compression) of plunger 3.Then, the end face 3b of plunger 3 push up
The fuel of the high pressure risen, is propped up after pressure on transfer valve 14 by being located at transfer valve by stream 12
The stream 43 of frame 42 and be connected and the other end with the export department of stream 43 via one end (upstream extremity)
The fuel high pressure pipe (not shown) that (downstream) is connected with Fuelinjection nozzle (not shown) is to fuel
Injection valve supplies.
Fuel-injection pump 1 according to present embodiment, by conveying valve seat 4 axle portion 4a outer peripheral face with
(small) gap between the inner peripheral surface of plunger barrel 5 and move to the high pressure of sealing ring 32 side
Fuel was directed in recess 21 via cross-drilled hole 25 and pod 24 before arriving sealing ring 32.
Thereby, it is possible to prevent the inner circumferential of axle portion 4a outer peripheral face and the plunger barrel 5 being located at conveying valve seat 4
The deterioration of the sealing ring 32 between face, improves the durability of sealing ring 32, thus realizes maintenance cycle
Long life.
It addition, according to the fuel-injection pump 1 of present embodiment, being positioned at outside radial direction of cross-drilled hole 25
Opening be arranged to be arranged on pump case 2 outer peripheral face location screw 23 leading section, axle portion carry out
The bottom surface of the pod 24 housed.That is, a part for cross-drilled hole 25 is served as, therefore due to pod 24
The length of cross-drilled hole 25 can be shortened, thus reduce the pressure loss in cross-drilled hole 25, make from cross-drilled hole 25
The flowing of the fuel in recess 21 is more smoothly.
And, in the fuel-injection pump 1 of present embodiment, it is positioned at the state of the top at plunger barrel 5
Under, than be located at conveying valve seat 4 axle portion 4a outer peripheral face and the inner peripheral surface of plug tube 5 between close
Seal ring 32 is on the lower and closest to the position of sealing ring 32, and be provided with cross-drilled hole 25 is positioned at radius
Opening inside direction.That is, in the outer peripheral face and plunger barrel 5 of the axle portion 4a of conveying valve seat 4
Between side face, the fuel of supply plays the effect as lubricant.Therefore, it is possible to make plunger barrel 5 along axle
To moving swimmingly, it is possible to reduce the outer peripheral face of the axle portion 4a carrying valve seat 4 and the interior of plunger barrel 5
The wear extent of side face.
On the other hand, the internal combustion engine of the fuel-injection pump possessing present embodiment possesses and is prevented from being located at
Conveying valve seat 4 axle portion 4a outer peripheral face and the inner peripheral surface of plunger barrel 5 between sealing ring 32 deterioration,
The durability improving sealing ring 32 and the fuel-injection pump 1 of the long life realizing maintenance cycle.Therefore,
The frequency making internal combustion engine shut down because safeguarding fuel-injection pump 1 can be reduced, it is possible to increase internal combustion
The reliability of machine.
It addition, according to the internal combustion engine of the fuel-injection pump possessing present embodiment, by conveying valve seat 4
Axle portion 4a outer peripheral face and the inner peripheral surface of plunger barrel 5 between (small) gap and move to close
The fuel of the high pressure of seal ring 32 side is directed to recess 21 via cross-drilled hole 25 between arrival sealing ring 32
In, the end face 3b being positioned at plunger 3 and conveying valve seat it is directed to from the suction inlet 22 being located at plunger barrel 5
In working cylinder 11 between the lower surface 4b of the axle portion 4a of 4, it is utilized as fuel.
Thereby, it is possible to use the combustion discharged outside system as thing of releasing in prior art the most lavishly
Material, thus improve fuel availability.
It should be noted that the invention is not limited in above-mentioned embodiment, can be without departing from this
Various change, deformation is carried out in the range of bright purport.
Symbol description
1 fuel-injection pump
2 pump cases
3 plungers
3a end face
4 conveying valve seats
4a axle portion
4b lower surface
5 plunger barrels
11 working cylinders
21 recesses
22 suction inlets
23 location screws
24 pods
25 cross-drilled holes
32 sealing rings
41 fuel suction port
Claims (4)
1. a fuel-injection pump, it possesses:
Pump case, it is provided with fuel suction port in side；
Plunger barrel, it is housed in described pump case, axially moves back and forth in described pump case；
Conveying valve seat, it possesses the axle portion being housed in working cylinder, and described pump case is positioned at upper end
Opening inaccessible, this working cylinder is axially arranged in the inside of described plunger barrel；
Plunger, it axially moves back and forth in described working cylinder,
Upper via at described plunger barrel of the fuel being flowed in described pump case from described fuel suction port
The recess formed between outer peripheral face and the inner peripheral surface of the described pump case opposed with it in half portion, and from being located at
The suction inlet of described plunger barrel is directed to the described of the end face being positioned at described plunger and described conveying valve seat
In described working cylinder between the lower surface in axle portion, the end face jack-up of described plunger become high pressure
Fuel, wherein,
Outer peripheral face in the upper end of described plunger barrel be provided with by described recess be formed at described defeated
Send valve seat described axle portion outer peripheral face and the inner peripheral surface of described plunger barrel between gap connection horizontal stroke
Hole.
Fuel-injection pump the most according to claim 1, wherein,
The opening outside radial direction that is positioned at of described cross-drilled hole is arranged at being arranged on outside described pump case
The leading section, axle portion of the location screw on side face carries out the bottom surface of the pod housed.
Fuel-injection pump the most according to claim 1, wherein,
When described plunger barrel is positioned at the top, than the described axle being located at described conveying valve seat
Sealing ring between outer peripheral face and the inner peripheral surface of described plunger barrel in portion is on the lower and closest to described close
The position of seal ring, is provided with the opening being positioned at inside radial direction of described cross-drilled hole.
4. an internal combustion engine, it possesses the fuel-injection pump according to any one of claims 1 to 3.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012044676A JP5404834B2 (en) | 2012-02-29 | 2012-02-29 | Fuel injection pump |
| JP2012-044676 | 2012-02-29 | ||
| PCT/JP2013/054968 WO2013129401A1 (en) | 2012-02-29 | 2013-02-26 | Fuel injection pump and internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103946534A CN103946534A (en) | 2014-07-23 |
| CN103946534B true CN103946534B (en) | 2016-08-24 |
Family
ID=49082598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380003996.5A Active CN103946534B (en) | 2012-02-29 | 2013-02-26 | Fuel-injection pump and internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5404834B2 (en) |
| KR (1) | KR101564183B1 (en) |
| CN (1) | CN103946534B (en) |
| WO (1) | WO2013129401A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6267278A (en) * | 1985-09-20 | 1987-03-26 | Mitsubishi Heavy Ind Ltd | Fuel injection timing changing device |
| JP2518343B2 (en) * | 1988-02-19 | 1996-07-24 | 日本電装株式会社 | Fuel injection pump |
| EP0690220A1 (en) | 1994-06-29 | 1996-01-03 | Lucas Industries Public Limited Company | Variable output pump |
| JPH1113590A (en) * | 1997-06-19 | 1999-01-19 | Zexel Corp | Pre-stroke adjusting mechanism for fuel injection pump |
| JP4625789B2 (en) * | 2006-07-20 | 2011-02-02 | 日立オートモティブシステムズ株式会社 | High pressure fuel pump |
-
2012
- 2012-02-29 JP JP2012044676A patent/JP5404834B2/en active Active
-
2013
- 2013-02-26 WO PCT/JP2013/054968 patent/WO2013129401A1/en active Application Filing
- 2013-02-26 CN CN201380003996.5A patent/CN103946534B/en active Active
- 2013-02-26 KR KR1020147015477A patent/KR101564183B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| JP2013181432A (en) | 2013-09-12 |
| CN103946534A (en) | 2014-07-23 |
| KR101564183B1 (en) | 2015-10-28 |
| WO2013129401A1 (en) | 2013-09-06 |
| KR20140076647A (en) | 2014-06-20 |
| JP5404834B2 (en) | 2014-02-05 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170815 Address after: Tokyo, Japan Co-patentee after: Japan motor Limited by Share Ltd Patentee after: Mit-subishi Heavy Industries Ltd. Address before: Tokyo, Japan Patentee before: Mit-subishi Heavy Industries Ltd. |
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| TR01 | Transfer of patent right |