CN205744225U - The common rail pump parts of single cylinder diesel high voltage common rail pump - Google Patents
The common rail pump parts of single cylinder diesel high voltage common rail pump Download PDFInfo
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- CN205744225U CN205744225U CN201620597730.9U CN201620597730U CN205744225U CN 205744225 U CN205744225 U CN 205744225U CN 201620597730 U CN201620597730 U CN 201620597730U CN 205744225 U CN205744225 U CN 205744225U
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Abstract
A kind of common rail pump parts of single cylinder diesel high voltage common rail pump, including seat, plunger spring, plunger, plunger guide set, radial direction seal ring, high pressure chest, oil duct allotter, steel ball, inlet valve spring, delivery valve seat, fuel-displaced spool, oil outlet valve spring and oil outlet valve spring seat and high-speed electromagnetic valve under the pump housing, tappet body, plunger spring, it can be integrated with common rail, can be connected with fuel injector by common rail again, using high-speed electromagnetic valve to replace proportional solenoid in prior art, cost is greatly lowered；The lifting moving of tappet body guides and location structure is arranged in pump housing endoporus, to diesel-engine body without particular design requirement；It can directly carry out common rail EFI Promotion Transformation to existing diesel, and carrying out state three standard environment protection emission for existing single cylinder diesel is the most economically viable technical scheme, uses this utility model that single cylinder diesel can be made to reach state four discharge standard.
Description
Technical field
This utility model relates to the combustion system of single cylinder diesel, particularly relates in the high pressure co-rail system of single cylinder diesel
Common rail pump assembly.
Background technology
Single cylinder diesel is because of reasons such as it are cheap, light for a long time, is widely used in stand-by power supply, agricultural machine
Tool, water lifting machinery, engineering machinery, the every profession and trade such as peculiar to vessel, fall behind due to the emission level of single cylinder diesel, national environmental protection in recent years
The raising of emission request, domestic market share is progressively compressed；According to ic engine industry association of China data, China's single cylinder in 2015
Diesel engine yield is at about 4,000,000, and at about 8,000,000 during peak value, single cylinder engine recoverable amount is at about 20,000,000；One side
Face, single cylinder diesel industry entirety emission level fall behind, and cause it to discharge substantial amounts of harmful gas every year in air；The opposing party
Face, falls behind emission level and it is gradually repelled by market, be badly in need of the update of technology.
China will carry out non-rice habitats state three discharge standard the end of the year 2016 comprehensively, it is contemplated that within 2018, will implement non-rice habitats state 4
Discharge standard, wherein single cylinder diesel is just within the scope of the restriction of this regulation.
After Abgasgesetz upgrading, the common rail system of single cylinder diesel will become the basic of Single Cylinder Diesel Engine Emission technology upgrading
Property solution；In published single cylinder diesel common rail system technical scheme, mechanical part comprise common rail pump, common rail pipe,
The big parts of fuel injector three, use high-pressure oil pipe to connect between these three big parts.Although the technical scheme of this replacement is capable of
The high-pressure common rail EFI of single cylinder diesel, but, the common rail system cost of existing single cylinder diesel is the highest, and volume is too big, nothing
Method is directly applied on existing single cylinder diesel.
" integrated diesel machine high pressure common rail fuel injection system height is disclosed in patent of invention 201610025226.6
Pressure oil pump assembly ", it still continues routine techniques thinking, system mechanics part is divided into three big parts, uses height each other
Pressuring oil pipe connects；In the invention, the tappet body in described high-pressure fuel injection pump assembly guides the machine relying on diesel engine, i.e. diesel engine
Body must redesign, and needs to leave special pilot hole on body, and the body requirement of diesel engine redesigns processing, whole adds
Work production line must put into again, puts into the biggest；Meanwhile, the fuel-flow control mode adoption rate electromagnetism of this high-pressure fuel injection pump assembly
Valve inlet metering controls, and the price of this electromagnetic valve is higher.
" common-rail high-pressure pump of pump rail one ", described oil pump is disclosed in utility model patent ZL201120052744.X
It is applied to multi-cylinder diesel engine oil supply system；The driving of its oil pump is performed by self camshaft, and oil pump is bulky, at one-cylinder diesel
Cannot directly apply on machine, can not quote, use the design of indent end face structure at this utility model mesohigh original paper plunger bushing,
Manufacturability extreme difference, had both improve processing, the technical difficulty of assembling, had increased cost, again can not be with the machine of existing single cylinder diesel
Body supports the use, the substituting extreme difference to the injection pump of existing single cylinder diesel.Existing single cylinder diesel produces commercial city not to be recognized
Can, less accept.
To this end, applicants have invented a kind of single cylinder diesel combined type high voltage common rail pump, it includes single cylinder common rail accumulation of energy
Device 1 and single cylinder common rail pump parts, single cylinder common rail accumulator 1 and single cylinder common rail pump parts are fixedly connected into hermetically by securing member
Integrally.It is according to existing single cylinder diesel feature design, have strong adaptability, structure through gathering, low cost, Technology Potential deep
Feature, can directly apply on existing single cylinder diesel, and the body of existing diesel, without changing, is existing single cylinder diesel
Discharge reaches the ideal scheme of state three standard.Wherein, single cylinder common rail pump parts are one of the most key parts.
Utility model content:
The purpose of this utility model is to provide the common rail pump parts of a kind of single cylinder diesel high voltage common rail pump, uses it to make
The pump housing in single cylinder diesel high pressure co-rail system is directly installed on the body of existing diesel, to substitute existing oil spout
Pump.
The technical scheme that this utility model is taked:
The common rail pump parts of a kind of single cylinder diesel high voltage common rail pump, is characterized in that: include the pump housing, tappet body, plunger bullet
Seat, plunger spring, plunger, plunger guide set, radial direction seal ring, high pressure chest, oil duct allotter, steel ball, inlet valve bullet under spring
Spring, delivery valve seat, fuel-displaced spool, oil outlet valve spring, oil outlet valve spring seat and high-speed electromagnetic valve, be provided with at the center of delivery valve seat
Oil outlet, is provided with steel ball cavity volume in the lower surface of delivery valve seat, is provided with upside oil input channel in the side of delivery valve seat；Divide at oil duct
The center of orchestration is provided with the oil-feed blind hole of upper end open, is provided with downside oil input channel in the side of oil duct allotter, distributes at oil duct
The oil input channel lower end, downside of device is provided with horizontal oil input channel, is provided with vertical oil between the upper surface of oil duct allotter and lower surface
Road, is provided with the recessed oil pit of oil-feed in the lower surface of oil duct allotter, and vertical oil duct oil pit recessed with oil-feed interlinks；The described pump housing includes
Butt hole, threaded connection hole, mating holes, transitional pore, lower pilot hole, electromagnetic valve installing hole, turn to fuel feed hole, butt hole, screw thread
Connecting hole, mating holes, transitional pore, lower pilot hole are the most sequentially coaxially distributed；Plunger guide set is rotated with the screw thread at the pump housing
In connecting hole, oil duct allotter and delivery valve seat are arranged in butt hole, and delivery valve seat is positioned at the top of oil duct allotter, steel
Pearl is arranged between delivery valve seat and oil duct allotter, and delivery valve core retainer plate is contained in the oil outlet of delivery valve seat, inlet valve spring
Being arranged between fuel-displaced spool lower end and steel ball, the lower end of oil outlet valve spring is sleeved on the epimere of fuel-displaced spool, oil outlet valve spring
In the endoporus of the upper end that cover for seat is contained in oil outlet valve spring, under plunger spring, cover for seat is contained on plunger and is positioned at the lower end of plunger, post
Plug sleeve is contained in the pilot hole of plunger guide set, and plunger spring is arranged under plunger guide set and plunger spring between seat, tappet
Body is sleeved in the lower pilot hole of the pump housing, and is carried out spacing by spacer pin to the lifting travel of tappet body, the lower end of plunger with very
Cylinders contact.
Further, between plunger guide set and the mating holes of the pump housing, it is provided with radial direction seal ring.
Further, between plunger guide set and the mating holes of the pump housing, it is provided with two radial seals axially spacedly
Circle.
Further, the interface of the pump housing is provided with end-face seal ring.
This utility model can be mounted directly with single cylinder common rail accumulator, it is achieved compact type common rail pump, it is also possible to logical
Cross common rail pipe to be connected with fuel injector, i.e. rail, pump split connects.
When this utility model and single cylinder common rail accumulator are mounted directly, by the butt hole of the pump housing, single cylinder common rail are installed and store
Can device, described single cylinder common rail accumulator include common rail body, level pressure oil road, pressure accumulation cavity volume, level pressure oil input channel, pressure transducer and
Unidirectional go out oil pocket, pressure accumulation cavity volume is arranged in common rail body, level pressure oil road, level pressure oil input channel, pressure transducer and unidirectional fuel-displaced
Chamber is all connected with pressure accumulation cavity volume, wherein, level pressure oil road, level pressure oil input channel and unidirectional go out oil pocket be coaxially disposed；Single cylinder common rail
One it is fixedly connected into hermetically after the oil inlet end of accumulator and the oil outlet end docking of single cylinder common rail pump.
Its work process is as follows:
Oil-absorbing process: when camshaft is in descending branch, plunger spring drives seat under tappet body and plunger spring, plunger to synchronize
Descending, now high pressure chest volume increases and forms negative pressure, and the recessed oil pit of oil-feed of oil duct allotter lower end passes through vertical oil duct and steel
The cavity volume of pearl is connected, and now high-speed electromagnetic valve energising is in open mode, and fuel oil enters by turning to oil input channel, high-speed electromagnetic valve
Enter in the butt hole of the pump housing, then enter level by the upside oil input channel of delivery valve seat and the downside oil input channel of oil duct allotter
Oil input channel and oil-feed blind hole push steel ball open, enter back into steel ball cavity volume and suck high pressure chest from vertical oil duct；
Force feed process: when camshaft is in ascent stage, tappet body promotes and moves on plunger lower end, and plunger spring is at plunger bullet
Being compressed under the effect of seat under spring, now, high pressure chest smaller volume, oil pressure raises, and the fuel oil attracted deposit in high pressure chest is then from oil-feed
Recessed oil pit, vertical oil duct enter in steel ball cavity volume, steel ball pressurized fuel effect lower seal be pressed together on opening of oil-feed blind hole
At Kou, closing oil-feed blind hole, pressurized fuel promotes and moves on fuel-displaced spool, so that fuel-displaced spool is in opening, pressure fires
Oil is entered in pressure accumulation cavity volume by the level pressure oil input channel of single cylinder common rail accumulator, and oil pressure in pressure accumulation cavity volume is carried out by pressure transducer
Observing and controlling, when oil pressure reaches predetermined value, inputs fueling injection equipment from level pressure oil road, completes force feed process.
This utility model is not only suitable for the integration of oil pump and common rail, is suitable for again split between oil pump and common rail and connects, oil
Pump can be mounted directly use on existing diesel, it is not necessary to additionally processes the installing hole system of the body of diesel engine, with
Time cancel the common rail pipe connecting common rail and oil pump, moreover it is possible to reduce the volume of single cylinder diesel high voltage common rail pump substantially, use
High-speed electromagnetic valve replaces proportional solenoid in prior art, and cost can reduce by 10%～15%；In this utility model, very
The lifting moving of cylinder guides and location structure is arranged in pump housing endoporus, to diesel-engine body without particular design requirement；It
Existing diesel directly can be carried out common rail EFI Promotion Transformation, state three standard environment protection emission is carried out for existing single cylinder diesel
It is the most economically viable technical scheme, uses this utility model that single cylinder diesel can be made to reach state four discharge standard.
In this utility model, high voltage device plunger guide set is carried out separate design with the pump housing and become multistage cylindric knot
Structure, this structure circumference homogenizing is symmetrical, beneficially the high accuracy processing of later stage plunger bushing mesopore；Compare abnormity more of the prior art
Structure, needs to do counterweight and processes, and technology difficulty is substantially reduced；The movement parts such as tappet body, plunger spring, interior pack arrangement designs, keeps away
Exempt to produce, with parts and components of diesel engine, the probability collided, interfere, affect.Compact conformation of the present utility model, low cost, technique
Property good, stable performance, be applicable to the high pressure co-rail system oil feed pump assembly that single cylinder diesel uses.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of single cylinder diesel combined type high voltage common rail pump；
Fig. 2 is the structural representation of single cylinder common rail accumulator；
Fig. 3 is the structural representation (i.e. this utility model) of single cylinder common rail pump；
Fig. 4 is the structural representation of the pump housing；
Fig. 5 is the structural representation of delivery valve seat；
Fig. 6 is the structural representation of oil duct allotter；
In figure: 1-single cylinder common rail accumulator；2-single cylinder common rail pump；3-end-face seal ring；11-common rail body；12-level pressure is fuel-displaced
Road；13-pressure accumulation cavity volume；14-level pressure oil input channel；15-pressure transducer；16-unidirectional go out oil pocket；17-oil inlet end；The 21-pump housing；
22-tappet body；Seat under 23-plunger spring；24-plunger spring；25-plunger；26-plunger guide set；27-radial direction seal ring；28-
High pressure chest；29-oil duct allotter；30-steel ball；31-inlet valve spring；32-delivery valve seat；The fuel-displaced spool of 33-；34-delivery valve
Spring；35-oil outlet valve spring seat；36-high-speed electromagnetic valve；37-spacer pin；The spacing jump ring of 38-；211-butt hole；212-screw thread
Connecting hole；213-mating holes；214-transitional pore；Pilot hole under 215-；216-electromagnetic valve installing hole；217-turns to oil input channel；
291-oil-feed blind hole；Oil input channel on the downside of 292-；The horizontal oil input channel of 293-；The vertical oil duct of 294-；The recessed oil pit of 295-oil-feed；321-goes out
Oilhole；322-steel ball cavity volume；Oil input channel on the upside of 323-.
Detailed description of the invention:
Detailed description of the invention of the present utility model is described below in conjunction with the accompanying drawings:
Embodiment 1: a kind of use single cylinder diesel combined type high voltage common rail pump of the present utility model, such as Fig. 1～Fig. 6 institute
Showing, it is made up of single cylinder common rail accumulator 1 and single cylinder common rail pump 2, and single cylinder common rail accumulator 1 and single cylinder common rail pump 2 pass through end face
Sealing ring 3 is fixedly connected into one hermetically；Described single cylinder common rail accumulator 1 includes common rail body 11, level pressure oil road 12, pressure accumulation
Cavity volume 13, level pressure oil input channel 14, pressure transducer 15 and unidirectional go out oil pocket 16, pressure accumulation cavity volume 13 is arranged in common rail body 11, fixed
Extrude oil duct 12, level pressure oil input channel 14, pressure transducer 15 with unidirectional go out oil pocket 16 be all connected with pressure accumulation cavity volume 13, wherein,
Level pressure oil road 12, level pressure oil input channel 14 and unidirectional go out oil pocket 16 be coaxially disposed；Described single cylinder common rail pump 2 includes the pump housing 21, endures
Seat 23, plunger spring 24, plunger 25, plunger guide set 26, radial direction seal ring 27, high pressure chest 28, oil under cylinder 22, plunger spring
Road allotter 29, steel ball 30, inlet valve spring 31, delivery valve seat 32, fuel-displaced spool 33, oil outlet valve spring 34, oil outlet valve spring
Seat 35 and high-speed electromagnetic valve 36, be provided with oil outlet 321 at the center of delivery valve seat 32, be provided with steel in the lower surface of delivery valve seat 32
Pearl cavity volume 322, is provided with upside oil input channel 323 in the side of delivery valve seat 32；It is provided with upper end at the center of oil duct allotter 29 to open
Mouthful oil-feed blind hole 291, be provided with in the side of oil duct allotter 29 downside oil input channel 292, enter in the downside of oil duct allotter 29
Oil duct 292 lower end is provided with horizontal oil input channel 293, is provided with vertical oil duct between the upper surface of oil duct allotter 29 and lower surface
294, the recessed oil pit of oil-feed 295 it is provided with in the lower surface of oil duct allotter 29, vertical oil duct 294 oil pit recessed with oil-feed 295 interlinks；
The described pump housing 21 includes butt hole 211, threaded connection hole 212, mating holes 213, transitional pore 214, lower pilot hole 215, electromagnetic valve
Installing hole 216, turn to fuel feed hole 217, butt hole 211, threaded connection hole 212, mating holes 213, transitional pore 214, lower pilot hole
215 are the most sequentially coaxially distributed；Plunger guide set 26 is rotated with in the threaded connection hole 212 of the pump housing 21, oil duct allotter
29 and delivery valve seat 32 be arranged in butt hole 211, and delivery valve seat 32 is positioned at the top of oil duct allotter 29, and steel ball 30 sets
Putting between delivery valve seat 32 and oil duct allotter 29, fuel-displaced spool 33 is sleeved in the oil outlet 321 of delivery valve seat 32, oil-feed
Valve spring 31 is arranged between fuel-displaced spool 33 lower end and steel ball 30, and the lower end of oil outlet valve spring 34 is sleeved on fuel-displaced spool 33
Epimere, in the endoporus of the upper end that oil outlet valve spring seat 35 is sleeved on oil outlet valve spring 34, under plunger spring, seat 23 is sleeved on plunger
On 25 and be positioned at the lower end of plunger 25, plunger 25 is sleeved in the pilot hole of plunger guide set 26, and plunger spring 24 is arranged on post
Under plug fairlead 26 and plunger spring between seat 23, tappet body 22 is sleeved in the lower pilot hole 215 of the pump housing 21, and by spacer pin
The lifting travel of 37 pairs of tappet bodies 22 carries out spacing, and spacer pin 37 is spacing by spacing jump ring 38, the lower end of plunger 25 and tappet body
22 contacts；It is provided with two radial direction seal rings 27 between plunger guide set 26 and the mating holes 213 of the pump housing 21.
This utility model both can be assembled into pump rail integration product with single cylinder common rail accumulator 1, it is also possible to passes through common rail pipe
Being connected with fuel injector, its advantage is directly to apply on existing single cylinder diesel.
Claims (4)
1. common rail pump parts for single cylinder diesel high voltage common rail pump, is characterized in that: include the pump housing (21), tappet body (22),
Seat (23), plunger spring (24), plunger (25), plunger guide set (26), radial direction seal ring (27), high pressure chest under plunger spring
(28), oil duct allotter (29), steel ball (30), inlet valve spring (31), delivery valve seat (32), fuel-displaced spool (33), delivery valve
Spring (34), oil outlet valve spring seat (35) and high-speed electromagnetic valve (36), be provided with oil outlet at the center of delivery valve seat (32)
(321), it is provided with steel ball cavity volume (322) in the lower surface of delivery valve seat (32), is provided with upside in the side of delivery valve seat (32) and enters
Oil duct (323)；The oil-feed blind hole (291) of upper end open it is provided with, in oil duct allotter (29) at the center of oil duct allotter (29)
Side be provided with downside oil input channel (292), be provided with horizontal oil input channel in downside oil input channel (292) lower end of oil duct allotter (29)
(293), between the upper surface and lower surface of oil duct allotter (29), it is provided with vertical oil duct (294), in oil duct allotter (29)
Lower surface be provided with the recessed oil pit of oil-feed (295), vertical oil duct (294) oil pit recessed with oil-feed (295) interlinks；The described pump housing (21)
Including butt hole (211), threaded connection hole (212), mating holes (213), transitional pore (214), lower pilot hole (215), electromagnetic valve
Installing hole (216), turn to fuel feed hole (217), butt hole (211), threaded connection hole (212), mating holes (213), transitional pore
(214), lower pilot hole (215) is the most sequentially coaxially distributed；The screw thread that plunger guide set (26) is rotated with at the pump housing (21) connects
Connecing in hole (212), oil duct allotter (29) and delivery valve seat (32) are arranged in butt hole (211), and delivery valve seat (32) position
In the top of oil duct allotter (29), steel ball (30) is arranged between delivery valve seat (32) and oil duct allotter (29), delivery valve
Core (33) is sleeved in the oil outlet (321) of delivery valve seat (32), and inlet valve spring (31) is arranged on fuel-displaced spool (33) lower end
And between steel ball (30), the lower end of oil outlet valve spring (34) is sleeved on the epimere of fuel-displaced spool (33), oil outlet valve spring seat (35)
In the endoporus of the upper end being sleeved on oil outlet valve spring (34), under plunger spring, seat (23) is sleeved on plunger (25) and is positioned at plunger
(25) lower end, plunger (25) is sleeved in the pilot hole of plunger guide set (26), and plunger spring (24) is arranged on plunger guide
Under set (26) and plunger spring between seat (23), tappet body (22) is sleeved in the lower pilot hole (215) of the pump housing (21), and by limiting
The lifting travel of tappet body (22) is carried out spacing by position pin (37), and the lower end of plunger (25) contacts with tappet body (22).
The most according to claim 1, the common rail pump parts of single cylinder diesel high voltage common rail pump, is characterized in that: at plunger guide set
And between the mating holes (213) of the pump housing (21), be provided with radial direction seal ring (27) (26).
The most according to claim 2, the common rail pump parts of single cylinder diesel high voltage common rail pump, is characterized in that: at plunger guide set
And between the mating holes (213) of the pump housing (21), be provided with two radial direction seal rings (27) (26) axially spacedly.
The most according to claim 1, the common rail pump parts of single cylinder diesel high voltage common rail pump, is characterized in that: at the pump housing (21)
Interface is provided with end-face seal ring (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620597730.9U CN205744225U (en) | 2016-06-18 | 2016-06-18 | The common rail pump parts of single cylinder diesel high voltage common rail pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620597730.9U CN205744225U (en) | 2016-06-18 | 2016-06-18 | The common rail pump parts of single cylinder diesel high voltage common rail pump |
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| CN205744225U true CN205744225U (en) | 2016-11-30 |
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ID=57385813
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952561A (en) * | 2016-06-18 | 2016-09-21 | 常州博瑞油泵油嘴有限公司 | Common rail pump component of high-pressure common rail pump of single-cylinder diesel |
| CN106499560A (en) * | 2016-12-27 | 2017-03-15 | 清华大学 | Fuel injection equipment (FIE) for automatically controlled single cylinder diesel |
| CN106640456A (en) * | 2016-12-27 | 2017-05-10 | 清华大学 | Pump rail body for fuel injection system of internal combustion engine |
| CN106762296A (en) * | 2016-12-27 | 2017-05-31 | 清华大学 | For the synthesis type high-pressure pump rail assembly of multi-cylinder engine |
| CN106762295A (en) * | 2016-12-27 | 2017-05-31 | 清华大学 | For the monomer high-pressure pump rail assembly of internal combustion engine |
| CN109723588A (en) * | 2019-02-28 | 2019-05-07 | 北油电控燃油喷射系统(天津)有限公司 | A kind of monomer high pressure fuel pump for common rail fuel injection system |
-
2016
- 2016-06-18 CN CN201620597730.9U patent/CN205744225U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952561A (en) * | 2016-06-18 | 2016-09-21 | 常州博瑞油泵油嘴有限公司 | Common rail pump component of high-pressure common rail pump of single-cylinder diesel |
| CN106499560A (en) * | 2016-12-27 | 2017-03-15 | 清华大学 | Fuel injection equipment (FIE) for automatically controlled single cylinder diesel |
| CN106640456A (en) * | 2016-12-27 | 2017-05-10 | 清华大学 | Pump rail body for fuel injection system of internal combustion engine |
| CN106762296A (en) * | 2016-12-27 | 2017-05-31 | 清华大学 | For the synthesis type high-pressure pump rail assembly of multi-cylinder engine |
| CN106762295A (en) * | 2016-12-27 | 2017-05-31 | 清华大学 | For the monomer high-pressure pump rail assembly of internal combustion engine |
| CN106762295B (en) * | 2016-12-27 | 2018-02-16 | 清华大学 | Monomer high-pressure pump rail assembly for internal combustion engine |
| CN106499560B (en) * | 2016-12-27 | 2018-04-20 | 清华大学 | Fuel injection equipment (FIE) for automatically controlled single cylinder diesel |
| CN106762296B (en) * | 2016-12-27 | 2018-04-20 | 清华大学 | Synthesis type high-pressure pump rail assembly for multi-cylinder engine |
| CN106640456B (en) * | 2016-12-27 | 2018-05-29 | 清华大学 | For the pump rail body of internal combustion engine fuel injection system |
| CN109723588A (en) * | 2019-02-28 | 2019-05-07 | 北油电控燃油喷射系统(天津)有限公司 | A kind of monomer high pressure fuel pump for common rail fuel injection system |
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| C14 | Grant of patent or utility model | ||
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