CN103993999A - High-pressure oil pump for heavy-duty diesel engine - Google Patents
High-pressure oil pump for heavy-duty diesel engine Download PDFInfo
- Publication number
- CN103993999A CN103993999A CN201410221292.1A CN201410221292A CN103993999A CN 103993999 A CN103993999 A CN 103993999A CN 201410221292 A CN201410221292 A CN 201410221292A CN 103993999 A CN103993999 A CN 103993999A
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- oil
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- pump housing
- screw
- spring
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- 238000007789 sealing Methods 0.000 claims abstract description 30
- 239000000446 fuel Substances 0.000 claims description 25
- 210000003746 feather Anatomy 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 7
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 73
- 238000009434 installation Methods 0.000 abstract 1
- 239000010687 lubricating oil Substances 0.000 abstract 1
- 239000002283 diesel fuel Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000010721 machine oil Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a high-pressure oil pump for a heavy-duty diesel engine. The high-pressure oil pump comprises an oil inlet metering valve, a pump body, a phase sensor, a low-pressure oil outlet screw, a low-pressure oil inlet screw, an oil delivery pump part, a gear, a spring cushion, a bolt, a rear flange part, a sealing block cover, a front flange part, a driving shaft, a locking nut, an oil valve upper base, an oil outlet valve spring, an oil valve part, a sealing gasket, an oil return screw part, an upper spring base, a plunger spring, a lower spring base, a first plug, a tappet part, a plunger and barrel assembly, a first O-shaped sealing ring, a second O-shaped sealing ring, a high-pressure oil inlet screw, a lubricating oil connector and a second plug. The high-pressure oil pump is simple and compact in structure, small in installation space and convenient to install. The oil supplying capacity is high and can reach 3300 cubic millimeters per cycle, and the low-speed oil supply starting capacity of the diesel engine is improved.
Description
Technical field
The invention belongs to automobile manufacturing field, the specifically match equipment of diesel engine, is the fuel feeding part of high pressure co-rail system.
Background technique
Along with the increasingly stringent of Abgasgesetz, high pressure co-rail system has become the main flow of diesel fuel injection system.High pressure oil pump is the critical component of high pressure co-rail system, and its technical merit has directly determined reliability, power character, the Economy of end product.Therefore, solve confession oil-proofness, the supply capability of high pressure oil pump, installability, with regard to the problem that has become product development to consider.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of large diesel engine high pressure oil pump is provided.
The object of the invention is to be achieved through the following technical solutions: a kind of large diesel engine high pressure oil pump, comprise: inlet metering valve, the pump housing, phase detector, the fuel-displaced screw of low pressure, low pressure oil-feed screw, oil transfer pump parts, gear, spring pad, bolt, rear flange parts, sealing door, forward flange parts, live axle, locking nut, the fuel tap seat of honour, oil outlet valve spring, fuel tap parts, gasket seal, oil return screw component, the spring seat of honour, piston spring, spring lower seat, the first screw plug, tappet parts, plunger coupled parts, the one O RunddichtringO, the 2nd O RunddichtringO, high pressure oil-feed screw, lubricant oil joint, the second screw plug, wherein, described rear flange parts are made up of the second bearing shell and rear flange, described forward flange parts are by the first bearing shell, forward flange, oil sealing composition, described tappet parts are by feather key, bearing pin, internal trolley, outer roller, tappet body composition, described plunger coupled parts is made up of plunger and plunger bushing,
Described feather key is fitted on tappet body, and internal trolley packs into after outer roller, is placed in tappet body, and bearing pin is through the mesopore composition tappet parts of tappet body and internal trolley; The spring seat of honour, piston spring, spring lower seat, tappet parts are placed in the pump housing from pump housing lower end successively, in the guiding groove of the feather key on tappet parts on the pump housing, are free to slide; The first bearing shell and oil sealing are pressed into respectively and in forward flange, form forward flange parts; The front end that forward flange parts are placed in the pump housing is fixedly connected with the pump housing and passes through O RunddichtringO and pump housing sealing, and forward flange parts and live axle pass through oil sealing sealing; Sealing door and pump housing interference fit, the auxiliary mounting hole in the first screw plug and pump housing side is threaded connection; The second bearing shell is pressed in rear flange, and be enclosed within on live axle and be fixedly connected with the pump housing, and by O RunddichtringO and pump housing sealing; Gear is fixed on live axle by bolt and spring washer; Phase detector is fixedly connected with rear flange; Oil transfer pump parts are fixedly connected with rear flange; The turnover oilhole of the fuel-displaced screw of low pressure oil-feed screw and low pressure and oil transfer pump parts is threaded connection; Gasket seal, fuel tap parts, oil outlet valve spring, the fuel tap seat of honour are placed in the plunger bushing of plunger coupled parts successively, compress by locking nut, be threaded connection, and seal by O RunddichtringO between locking nut and plunger bushing; Plunger is placed in plunger bushing; Plunger coupled parts is fixedly connected with the pump housing; Between the one O RunddichtringO, the 2nd O RunddichtringO, the pump housing and plunger bushing, form the cavity volume of sealing; High pressure oil-feed screw is connected with the pump housing by screw thread with oil return screw component; Oilhole on lubricant oil joint and the pump housing is threaded connection; Oil filling hole on the second screw plug and the pump housing is threaded connection; Inlet metering valve is fixedly connected with the pump housing.
Further, the bore area of described the first bearing shell and the second bearing shell scribbles modified Teflon.
Further, use two secondary plunger coupled partss and the live axle fuel feeding that cooperatively interacts, the cam profile of live axle is three tangent line peach-shaped cam structures.
Advantage of the present invention and beneficial effect are:
1. appearance structure of the present invention is simple, compact, and required installing space is little, is convenient to install;
2. the present invention has extended the working life of easily damaged parts, has reduced fault rate;
3. the supply capability of the heavy high pressure oil pump of the present invention is strong, can reach 3300 cubic millimeters/circulation;
4. the present invention uses oil lubricating, has good greasy property, can prevent part corrosion, meets for the impact of bearing transmission, plays the effect of buffering;
5. the present invention has improved the low speed fuel feeding startup ability of diesel engine.
Brief description of the drawings
Fig. 1 is the main sectional view of structure of the present invention;
Fig. 2 is structure side sectional view of the present invention;
Fig. 3 is plan view of the present invention;
In figure, inlet metering valve 1, the pump housing 2, phase detector 3, the fuel-displaced screw 4 of low pressure, low pressure oil-feed screw 5, oil transfer pump parts 6, gear 7, spring pad 8, bolt 9, the second bearing shell 10, rear flange 11, sealing door 12, the first bearing shell 13, forward flange 14, oil sealing 15, live axle 16, locking nut 17, the fuel tap seat of honour 18, oil outlet valve spring 19, fuel tap parts 20, gasket seal 21, oil return screw component 22, the spring seat of honour 23, piston spring 24, spring lower seat 25, the first screw plug 26, feather key 27, bearing pin 28, internal trolley 29, outer roller 30, tappet body 31, plunger 32, plunger bushing 33, the one O RunddichtringO 34, the 2nd O RunddichtringO 35, high pressure oil-feed screw 36, lubricant oil joint 37, the second screw plug 38.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As Figure 1-3, a kind of large diesel engine high pressure oil pump of the present invention, comprising: inlet metering valve 1, the pump housing 2, phase detector 3, the fuel-displaced screw 4 of low pressure, low pressure oil-feed screw 5, oil transfer pump parts 6, gear 7, spring pad 8, bolt 9, rear flange parts, sealing door 12, forward flange parts, live axle 16, locking nut 17, the fuel tap seat of honour 18, oil outlet valve spring 19, fuel tap parts 20, gasket seal 21, oil return screw component 22, the spring seat of honour 23, piston spring 24, spring lower seat 25, the first screw plug 26, tappet parts, plunger coupled parts, the one O RunddichtringO 34, the 2nd O RunddichtringO 35, high pressure oil-feed screw 36, lubricant oil joint 37, the second screw plug 38, wherein, described rear flange parts are made up of the second bearing shell 10 and rear flange 11, and described forward flange parts are by the first bearing shell 13, forward flange 14, oil sealing 15 forms, and described tappet parts are by feather key 27, bearing pin 28, internal trolley 29, outer roller 30, tappet body 31 forms, and described plunger coupled parts is made up of plunger 32 and plunger bushing 33.
Described feather key 27 is fitted on tappet body 31, and internal trolley 29 packs into after outer roller 30, is placed in tappet body 31, and bearing pin 28 is through the mesopore composition tappet parts of tappet body 31 and internal trolley 29; The spring seat of honour 23, piston spring 24, spring lower seat 25, tappet parts are placed in the pump housing 2 from the pump housing 2 lower ends successively, in the guiding groove of the feather key 27 on tappet parts on the pump housing 2, are free to slide; The first bearing shell 13 and oil sealing 15 are pressed into respectively and in forward flange 14, form forward flange parts; The front end that forward flange parts are placed in the pump housing 2 is fixedly connected with the pump housing 2 and seals by O RunddichtringO and the pump housing 2, and forward flange parts and live axle 16 seal by oil sealing 15; While packing live axle 16 into because piston spring 24 is under free state, can make live axle 16 interfere and cannot assemble with tappet parts, now, can be by the auxiliary mounting hole of the mounting hole of the pump housing 2 bottoms and the pump housing 2 sides, piston spring 24 is compressed to and is conducive to the position that live axle 16 assembles, put into live axle 16, sealing door 12 and the pump housing 2 interference fit, the first screw plug 26 is threaded connection with the auxiliary mounting hole in the pump housing 2 sides; The second bearing shell 10 is pressed in rear flange 11, is enclosed within on live axle 16 and is fixedly connected with by screw with the pump housing 2, and seal by O RunddichtringO and the pump housing 2; Gear 7 is fixed on live axle 16 by bolt 9 and spring pad 8; Phase detector 3 is fixedly connected with rear flange 11 by screw; Oil transfer pump parts 6 are fixedly connected with rear flange 11 by screw; The fuel-displaced screw 4 of low pressure oil-feed screw 5 and low pressure is threaded connection with the turnover oilhole of oil transfer pump parts 6; Gasket seal 21, fuel tap parts 20, oil outlet valve spring 19, the fuel tap seat of honour 18 are placed in the plunger bushing 33 of plunger coupled parts successively, compress by locking nut 17, be threaded connection, and seal by O RunddichtringO between locking nut 17 and plunger bushing 33; Plunger 32 is placed in plunger bushing 33; Plunger coupled parts is fixedly connected with by screw with the pump housing 2; Between the one O RunddichtringO 34, the 2nd O RunddichtringO 35, the pump housing 2 and plunger bushing 33, form the cavity volume of sealing, prevent that diesel oil from leaking; High pressure oil-feed screw 36 is connected with the pump housing 2 by screw thread with oil return screw component 22; Lubricant oil joint 37 is threaded connection with the oilhole on the pump housing 2; The second screw plug 38 is threaded connection with the oil filling hole on the pump housing 2; Inlet metering valve 1 is fixedly connected with the pump housing 2 by screw.
The present invention uses inlet metering valve 1 to control the flow of low pressure oil way, thereby realizes the rail pressure control of system.
The present invention uses oil lubricating, has good greasy property, can prevent part corrosion, meets for the impact of bearing transmission, plays the effect of buffering.
The present invention coordinates with phase detector 3 by live axle 16, gear 7, can transmit accurately phase signal, finds compression top center.
High pressure oil pump of the present invention can be two cylinders in upright arrangement, 6 fuel feeding of every circulation, and its implementation is: use two secondary plunger coupled partss and live axle 16 fuel feeding that cooperatively interacts, the cam profile of live axle 16 is three tangent line peach-shaped cam structures.
High pressure oil pump of the present invention utilizes gearwheel (gear 7) to drive the working principle of small gear (gears on oil transfer pump parts 6), has promoted the speed ratio of oil transfer pump, thereby has promoted diesel engine low speed start ability.
The bore area of the first bearing shell 13 and the second bearing shell 10 scribbles modified Teflon material, this material makes bearing have good dimensional stability, the good ability that passes to, excellent wear resistance and extremely low friction factor, with live axle acting in conjunction, make the effect of sliding bearing better.
Working procedure of the present invention is as follows:
Driven by engine live axle 16 rotates, and the gear 7 being fixed on live axle 16 drives oil transfer pump running, diesel oil enters oil transfer pump parts 6 by low pressure oil-feed screw 5, after 6 pressurizations of oil transfer pump parts, imports to high pressure oil-feed screw 36 by the fuel-displaced screw 4 of low pressure, enters the pump housing 2, the opening and closing of the electrical signal control inlet metering valve 1 of inputting by outside, after inlet metering valve 1 is opened, diesel oil enters into an O RunddichtringO 34 by the oil circuit on the pump housing 2, the 2nd O RunddichtringO 35, in the cavity volume of the sealing forming between the pump housing 2 and plunger bushing 33, by the inclined oil hole of air on plunger bushing 33, a diesel oil part enters in the cavity volume between plunger bushing 33 and plunger 32, another part enters in fuel tap parts 20, it is descending that plunger 32 is subject to the spring-force driven dual of piston spring 24 to follow live axle 16, fuel tap parts 20 are subject to the impact unlatching that cavity pressure changes, diesel oil enters into plunger bushing 33, plunger 32, fuel tap parts 20 form cavity volume in, it is up that live axle 16 promotes plunger 32, oil outlet valve spring 19 is subject to plunger bushing 33, plunger 32, the impact of the cavity volume internal pressure that fuel tap parts 20 form is opened, diesel oil is forced out, enter in oil pipe through locking nut 17, after inlet metering valve 1 cuts out, in the time that the pump housing 2 internal pressures reach oil return screw component 22 cracking pressure, diesel oil is got back to fuel tank by oil return screw component 22.
Before high pressure oil pump running, need first pass through oil filling hole to the interior filling engine oil of the pump housing 2, when high pressure oil pump running, by machine oil oil inlet hole, to the interior supplementary machine oil of the pump housing 2, unnecessary machine oil enters the engine oil passage of motor by the oil circuit on forward flange parts, rear flange parts and the pump housing 2.
The present invention is applied in the electric control fuel oil jet system of heavy type car, can mate flexibly the motor below 450KW, and fuel feeding efficiency can reach 85%.
Claims (3)
1. a large diesel engine high pressure oil pump, is characterized in that, comprising: inlet metering valve (1), the pump housing (2), phase detector (3), the fuel-displaced screw of low pressure (4), low pressure oil-feed screw (5), oil transfer pump parts (6), gear (7), spring pad (8), bolt (9), rear flange parts, sealing door (12), forward flange parts, live axle (16), locking nut (17), the fuel tap seat of honour (18), oil outlet valve spring (19), fuel tap parts (20), gasket seal (21), oil return screw component (22), the spring seat of honour (23), piston spring (24), spring lower seat (25), the first screw plug (26), tappet parts, plunger coupled parts, the one O RunddichtringO (34), the 2nd O RunddichtringO (35), high pressure oil-feed screw (36), lubricant oil joint (37), the second screw plug (38), wherein, described rear flange parts are made up of the second bearing shell (10) and rear flange (11), and described forward flange parts are by the first bearing shell (13), forward flange (14), oil sealing (15) composition, described tappet parts are by feather key (27), bearing pin (28), internal trolley (29), outer roller (30), tappet body (31) composition, described plunger coupled parts is made up of plunger (32) and plunger bushing (33),
It is upper that described feather key (27) is fitted in tappet body (31), and internal trolley (29) packs into after outer roller (30), is placed in tappet body (31), and bearing pin (28) is through the mesopore composition tappet parts of tappet body (31) and internal trolley (29); The spring seat of honour (23), piston spring (24), spring lower seat (25), tappet parts are placed in the pump housing (2) from the pump housing (2) lower end successively, in the guiding groove of the feather key (27) on tappet parts on the pump housing (2), are free to slide; The first bearing shell (13) and oil sealing (15) are pressed into respectively composition forward flange parts in forward flange (14); The front end that forward flange parts are placed in the pump housing (2) is fixedly connected with the pump housing (2) and seals by seal ring and the pump housing (2), and forward flange parts and live axle (16) are by oil sealing (15) sealing; Sealing door (12) and the pump housing (2) interference fit, the first screw plug (26) is threaded connection with the auxiliary mounting hole in the pump housing (2) side; The second bearing shell (10) is pressed in rear flange (11), and be enclosed within live axle (16) and be above fixedly connected with the pump housing (2), and by seal ring and the pump housing (2) sealing; Gear (7) is fixed on live axle (16) by bolt (9) and spring pad (8); Phase detector (3) is fixedly connected with rear flange (11); Oil transfer pump parts (6) are fixedly connected with rear flange (11); Low pressure oil-feed screw (5) and the fuel-displaced screw of low pressure (4) are threaded connection with the turnover oilhole of oil transfer pump parts (6); Gasket seal (21), fuel tap parts (20), oil outlet valve spring (19), the fuel tap seat of honour (18) are placed in the plunger bushing (33) of plunger coupled parts successively, compress by locking nut (17), between locking nut (17) and plunger bushing (33), be threaded connection, and seal by seal ring; Plunger (32) is placed in plunger bushing (33); Plunger coupled parts is fixedly connected with the pump housing (2); Between the one O RunddichtringO (34), the 2nd O RunddichtringO (35), the pump housing (2) and plunger bushing (33), form the cavity volume of sealing; High pressure oil-feed screw (36) is connected with the pump housing (2) by screw thread with oil return screw component (22); Lubricant oil joint (37) is threaded connection with the oilhole on the pump housing (2); The second screw plug (38) is threaded connection with the oil filling hole on the pump housing (2); Inlet metering valve (1) is fixedly connected with the pump housing (2).
2. a kind of large diesel engine high pressure oil pump according to claim 1, is characterized in that, the bore area of described the first bearing shell (13) and the second bearing shell (10) scribbles modified Teflon.
3. a kind of large diesel engine high pressure oil pump according to claim 1, is characterized in that, uses two secondary plunger coupled partss and live axle (16) fuel feeding that cooperatively interacts, and the cam profile of live axle (16) is three tangent line peach-shaped cam structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410221292.1A CN103993999B (en) | 2014-05-25 | 2014-05-25 | Large diesel engine high pressure oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410221292.1A CN103993999B (en) | 2014-05-25 | 2014-05-25 | Large diesel engine high pressure oil pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103993999A true CN103993999A (en) | 2014-08-20 |
| CN103993999B CN103993999B (en) | 2016-01-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410221292.1A Active CN103993999B (en) | 2014-05-25 | 2014-05-25 | Large diesel engine high pressure oil pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103993999B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105508107A (en) * | 2016-01-14 | 2016-04-20 | 辽宁新风企业集团有限公司 | Integrated high-pressure oil pump assembly for high-pressure common-rail fuel injection system of diesel engine |
| CN105822476A (en) * | 2016-05-25 | 2016-08-03 | 辽阳新风科技有限公司 | High-pressure oil pump with oil inlet valve and diesel engine |
| CN105863917A (en) * | 2016-05-25 | 2016-08-17 | 辽阳新风科技有限公司 | High-pressure oil pump with electromagnetic valve and diesel engine |
| CN107002614A (en) * | 2014-12-16 | 2017-08-01 | 罗伯特·博世有限公司 | Pump, especially high-pressure fuel pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4273091A (en) * | 1978-09-28 | 1981-06-16 | Robert Bosch Gmbh | Fuel injection pump for internal combustion engines |
| CN201461177U (en) * | 2009-05-15 | 2010-05-12 | 余姚市舒春机械有限公司 | Injection pump assembly of diesel engine |
| KR20130130104A (en) * | 2011-12-29 | 2013-12-02 | (주)모토닉 | High presure fuel pump for direct injection type gasoline engine |
| CN203925844U (en) * | 2014-05-25 | 2014-11-05 | 辽宁新风企业集团有限公司 | A kind of large diesel engine high pressure oil pump |
-
2014
- 2014-05-25 CN CN201410221292.1A patent/CN103993999B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4273091A (en) * | 1978-09-28 | 1981-06-16 | Robert Bosch Gmbh | Fuel injection pump for internal combustion engines |
| CN201461177U (en) * | 2009-05-15 | 2010-05-12 | 余姚市舒春机械有限公司 | Injection pump assembly of diesel engine |
| KR20130130104A (en) * | 2011-12-29 | 2013-12-02 | (주)모토닉 | High presure fuel pump for direct injection type gasoline engine |
| CN203925844U (en) * | 2014-05-25 | 2014-11-05 | 辽宁新风企业集团有限公司 | A kind of large diesel engine high pressure oil pump |
Non-Patent Citations (1)
| Title |
|---|
| 刘永长: "《汽油发动机构造与原理》", 30 June 2001, 华中科技大学出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107002614A (en) * | 2014-12-16 | 2017-08-01 | 罗伯特·博世有限公司 | Pump, especially high-pressure fuel pump |
| CN107002614B (en) * | 2014-12-16 | 2019-12-03 | 罗伯特·博世有限公司 | Pump, especially high-pressure fuel pump |
| CN105508107A (en) * | 2016-01-14 | 2016-04-20 | 辽宁新风企业集团有限公司 | Integrated high-pressure oil pump assembly for high-pressure common-rail fuel injection system of diesel engine |
| CN105822476A (en) * | 2016-05-25 | 2016-08-03 | 辽阳新风科技有限公司 | High-pressure oil pump with oil inlet valve and diesel engine |
| CN105863917A (en) * | 2016-05-25 | 2016-08-17 | 辽阳新风科技有限公司 | High-pressure oil pump with electromagnetic valve and diesel engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103993999B (en) | 2016-01-27 |
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Effective date of registration: 20230525 Address after: 225500 No. 1, Shuguang Middle Road, Baimi Town, Jiangyan District, Taizhou City, Jiangsu Province Patentee after: Junfeng electric control technology (Taizhou) Co.,Ltd. Address before: Room 211, building 21, 1158 Jiuting Central Road, Jiuting Town, Songjiang District, Shanghai, 201615 Patentee before: Shanghai Junfeng Electric Control Technology Co.,Ltd. |
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