CN203532126U - Switching valve of high-pressure common-rail fuel injection pump - Google Patents
Switching valve of high-pressure common-rail fuel injection pump Download PDFInfo
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- CN203532126U CN203532126U CN201320544937.6U CN201320544937U CN203532126U CN 203532126 U CN203532126 U CN 203532126U CN 201320544937 U CN201320544937 U CN 201320544937U CN 203532126 U CN203532126 U CN 203532126U
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- oil
- high pressure
- valve
- switch valve
- fuel
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Abstract
The utility model provides a switching valve of a high-pressure common-rail fuel injection pump. An oil inlet valve spring (4) is arranged at the free end of a plunger piston (2), a low pressure sealing ball (6) is controlled to be communicated with a switching valve oil inlet channel (8), the switching valve oil inlet channel (8) passes through the center of the end face of a the valve body of the switching valve to extend to the valve body column face to be communicated with a plunger piston cavity (2), a low pressure fuel oil channel (1) is communicated, a switching valve oil outlet channel (9) is far away from the center of the end face of the valve body of the switching valve and passes through the front end face of the switching valve (7) to extend to the back end of the valve body to reach the center of the back end face, and the switching valve oil outlet channel (9) is communicated with a high pressure fuel oil channel (12) through a high pressure sealing ball and an oil valve spring (11). According to the switching valve, transition parts between a plunger piston cavity channel and the valve body of the switching valve in the prior art are reduced, the number of parts of the switching valve and the corresponding sealing faces are reduced, the installation size and the manufacturing cost can be effectively reduced, the fuel oil channel length is shortened, the fuel oil passing efficiency is improved, and the problems that in the prior art, two overlaid separating one-way valve components are large in bonding and occupation space, the number of the parts is large, and the manufacturing cost is high are solved.
Description
Technical field
The utility model relates to a kind of valve arrangement for fuel sealing, specifically a kind of high pressure valve structure that is mainly used in 120-200Mpa high-pressure common-rail oil pump.
Background technique
High pressure co-rail system is by high pressure oil pump, be total to rail chamber and high-pressure oil pipe, oil sprayer, ECU (Electrical Control Unit), various kinds of sensors and final controlling element, five parts form, wherein, high pressure oil pump is the interface between low pressure and high pressure fuel passage, low pressure blade oil pump is inputted high pressure oil pump by fuel oil, high pressure oil pump is sent fuel oil pressurization into high pressure oil rail, pressure in high pressure oil rail by ECU (Electrical Control Unit) according to the oily rail pressure of oily rail pressure sensor measurement and need to regulate, fuel oil in high pressure oil rail is through high-pressure oil pipe, according to the running state of machine, by ECU (Electrical Control Unit), from default map figure, determined suitable injection timing, oil injection duration sprays into cylinder by the electronic oil injection device of electrichydraulic control by fuel oil.The effect of rail high pressure oil pump is that appropriate fuel oil is pressed into oily rail by plunger altogether, for compensating oil spout and leaking the rail pressure causing, declines.Because the highest injection pressure allowable is that rigidity and sealing by high pressure oil pump main parts size determines, therefore, increase substantially injection pressure and will inevitably run into high pressure oil pump functional reliability, particularly caused being difficult to of fuel feed pump plunger couple, oiling valve and outlet valve excessive leakage sets up compared with the problem of high fuel pressure.Due to the poorly sealed fuel oil high-pressure leakage that causes between oiling valve, outlet valve and plunger bushing, the excessive leakage of fuel oil causes plunger bushing hot, and oil pump feed ability is accelerated to decline.In order to prevent the high pressure fuel passage fuel oil low voltage terminal that flows backwards back, need between high pressure fuel passage and low-voltage fuel passage, one-way valve be set, with this, guarantee that fuel oil can only enter high pressure fuel passage from low-voltage fuel passage; In order to realize high pressure oil pump high speed oil-break function, at low-voltage fuel, enter the one-way valve arranging between the passage of plunger cavity, the fuel oil only with certain pressure could enter plunger cavity by this valve, and this valve also has the effect of cutting out plunger cavity simultaneously.
Prior art adopts the one-way valve of two separating components shown in Fig. 2 to guarantee that fuel oil enters high pressure fuel passage 12 from low-voltage fuel passage 1 conventionally, when plunger 2 is descending, low pressure seal ball 6 is under fuel pressure effect, the spring force that overcomes oiling valve spring 4 is opened, fuel oil enters plunger cavity 5, when plunger is up, low pressure seal ball 6 is at the spring-force driven dual lower seal switch valve oil inlet passage 9 of oiling valve spring 4, high pressure sealing ball 10 is under fuel pressure effect, overcome the spring force of oil outlet valve spring 11 and the fuel pressure in high pressure fuel passage 12, high pressure sealing ball 10 is opened, fuel oil enters high pressure fuel passage 12, complete after compression stroke, high pressure sealing ball 10 is at the spring-force driven dual lower seal high pressure fuel passage 12 of oil outlet valve spring 11, prior art adopts the one-way valve of two stacks to realize respectively sealing and the open function of low-voltage fuel passage 1 and high pressure fuel passage 12, the deficiency of this structure is that sealing surface is more, more sealing surface has increased the risk that plane sealing leaks, next is that the combination of two one-way valve member takes up room greatly, number of spare parts increases, manufacture height.
Summary of the invention
The purpose of this utility model, for the above-mentioned deficiency of prior art, provides a kind of needs that can either meet one-way sealing and opened by pressure, can reduce again the high pressure shared-rail oil jetting pump high-voltage switch gear valve that installation dimension and cost are low.
Above-mentioned purpose of the present utility model can reach by following measures, a kind of high pressure shared-rail oil jetting pump switch valve, comprise, by the pump housing 3, enter the plunger 2 of plunger cavity 5 and be assemblied in the switch valve 7 in described plunger cavity 5, the low-voltage fuel passage 1 communicating with plunger cavity 5, high pressure fuel passage 12 and oiling valve spring 4 by switch valve oil discharge passage 9 through high pressure sealing ball 10 connected oil outlet valve springs 11, it is characterized in that, switch valve oil inlet passage 8 and switch valve oil discharge passage 9 are co-located on switch valve valve body, oiling valve spring 4 is arranged on the free end of described plunger 2, control low pressure seal ball 6 coupling cock valve oil inlet passages 8, switch valve oil inlet passage 8 is by switch valve valve body end face center, to valve body cylinder, extend and be communicated with plunger cavity 2, link up low-voltage fuel passage 1, switch valve oil discharge passage 9 is away from switch valve body end face center, by switch valve 7 front-end faces, to valve rear end, extend to ear end face center, through high pressure sealing ball 9 and fuel tap spring 11, be communicated with high pressure fuel passage 12.
The utility model has following beneficial effect than prior art.
The utility model is arranged on plunger 2 axle heads by oiling valve spring 4, control low pressure seal ball 6 coupling cock valve oil inlet passages 8, reduced the transition part arranging between prior art plunger cavity passage and switch valve valve body, switch valve number of spare parts and corresponding sealing surface reduce, can effectively reduce installation dimension and manufacture cost, shorten fuel oil oil duct length, improve fuel oil and pass through efficiency, two separated one-way valve member of stack of prior art have been solved large in conjunction with taking up room, number of spare parts is many, manufactures high problem.The utility model is co-located on switch valve oil inlet passage 8 and switch valve oil discharge passage 9 on switch valve valve body, oiling valve spring 4 is moved to plunger 2 axle heads, switch valve difficulty of processing reduces, intensity increases, and it is more to have overcome the separated one-way valve sealing surfaces of two of prior aries stack, the large and oiling valve of more plane sealing risk of leakage and outlet valve excessive leakage is caused is difficult to foundation compared with the problem of high fuel pressure.
Accompanying drawing explanation
Fig. 1 is the utility model high pressure oil pump switch valve structure generalized section.
Fig. 2 is the structural profile schematic diagram of a kind of high pressure oil pump switch valve of prior art.
In figure: 1, low-voltage fuel passage, 2, plunger, 3, the pump housing, 4, oiling valve spring, 5, plunger cavity, 6, low pressure seal ball, 7, switch valve, 8, switch valve oil inlet passage, 9, switch valve oil discharge passage, 10, high pressure sealing ball, 11, oil outlet valve spring, 12, high pressure fuel passage, 13, delivery connection.
Embodiment
Referring to Fig. 1.In embodiment described below, high pressure shared-rail oil jetting pump switch valve, comprise, by the pump housing 3, enter the plunger 2 of plunger cavity 5 and be assemblied in the switch valve 7 in described plunger cavity 5, by oiling valve spring 4, control low pressure seal ball 6 coupling cock valve oil inlet passages 8, the low-voltage fuel passage 1 communicating with plunger cavity 5, the high pressure fuel passage 12 by switch valve oil discharge passage 9 through high pressure sealing ball 10 connected oil outlet valve springs 11.Wherein, in order there to be better volumetric efficiency, require plunger cavity 5 volumes as far as possible little, need to control the minimum clearance of 2 of low pressure seal ball 6 and plungers simultaneously, during work, must guarantee, absence of collision between plunger 2 and low pressure seal ball 6, switch valve oil inlet passage 8 and switch valve oil discharge passage 9 are co-located on switch valve valve body, and oiling valve spring 4 is arranged on the free end of described plunger 2.On the cylindrical body of fuel tap spring 4 suit plunger 2 axle head step belows, control and fall into axle head ball-and-socket as the low pressure seal ball 6 of one-way valve, by the unlatching coupling cock valve oil inlet passage 8 of low pressure seal ball 6.Switch valve oil inlet passage 8 is by switch valve valve body end face center, to valve body cylinder, extend and be communicated with plunger cavity 2, link up low-voltage fuel passage 1, switch valve oil discharge passage 9, away from switch valve body end face center, extends to ear end face center by switch valve 7 front-end faces to valve rear end.High pressure sealing ball 9 gos deep into switch valve 7 ear end face center ball-and-sockets, falls into oil outlet valve spring 11 spring ends and is connected, and with switch valve 7 stack separated connected delivery connections (13), by high pressure sealing ball 9 and fuel tap spring 11, is communicated with high pressure fuel passage 12.Low-voltage fuel passage 1 tilts to extend to plunger cavity 5, coupling cock valve oil inlet passage 8 and switch valve oil discharge passage 9 from the pump body step of the pump housing 3.Due to the sealing and the precompression of oiling valve spring 4 and the conformity of rigidity that require switch valve 7 with low pressure seal ball 6, low pressure seal ball 6 and switch valve pass through conical surface seal between (7).When oily rail needs fuel oil to inject, low-voltage fuel channel pressure raises, coordinate plunger descending, fuel oil is pushed one-way valve open and is entered in plunger cavity, and when plunger is up, fuel oil is compressed, fuel pressure in plunger cavity is during higher than fuel pressure in oily rail, the one-way valve high pressure sealing ball 10 of high pressure fuel passage 12 is opened, and fuel oil enters in oily rail, the fuel oil of postinjection and leakage.During plunger 2 oil pumping, the pressure of low-voltage fuel passage 1 is pushed low pressure seal ball 7 open together in conjunction with the negative pressure in plunger cavity 5, enters plunger cavity 5.Low pressure seal ball 6 is opened under the acting in conjunction of low-voltage fuel passage 1 and plunger cavity 5 internal pressures.During plunger 2 compression fuel oil, plunger cavity 5 is by plunger 2 compression fuel oils, and low pressure seal ball 6, under the spring-force driven dual of oiling valve spring 4, makes low pressure seal ball 7 returns, forms conical surface seal with switch valve 7, and fuel oil enters switch valve oil discharge passage 9.Pressure in plunger cavity 5 is during higher than pressure in high pressure fuel passage 12, and high pressure sealing ball 10 is opened under oil outlet valve spring 11 effects, and fuel oil enters high pressure fuel passage 12.When plunger cavity 5 and high pressure fuel passage 12 isostasy, under the spring-force driven dual of oil outlet valve spring 11, high pressure sealing ball 10 returns, sealed plunger chamber 5 and high pressure fuel passage 12.
Guarantee sealing between switch valve 7 and the pump housing 3 and the sealing between switch valve 7 and high pressure sealing ball 10 in order to work, switch valve 7 by plane sealing, passes through conical surface seal between switch valve 7 and high pressure sealing ball 10 with the pump housing 3.
Claims (8)
1. a high pressure shared-rail oil jetting pump switch valve, comprise, by the pump housing (3), enter the plunger (2) of plunger cavity (5) and be assemblied in the switch valve (7) in described plunger cavity (5), the low-voltage fuel passage (1) communicating with plunger cavity (5), high pressure fuel passage (12) and oiling valve spring (4) by switch valve oil discharge passage (9) through the connected oil outlet valve spring (11) of high pressure sealing ball (10), it is characterized in that, switch valve oil inlet passage (8) and switch valve oil discharge passage (9) are co-located on switch valve valve body, oiling valve spring (4) is arranged on the free end of described plunger (2), control low pressure seal ball (6) coupling cock valve oil inlet passage (8), switch valve oil inlet passage (8) is by switch valve valve body end face center, to valve body cylinder, extend and be communicated with plunger cavity (2), link up low-voltage fuel passage (1), switch valve oil discharge passage (9) is away from switch valve body end face center, by switch valve (7) front-end face, to valve rear end, extend to ear end face center, through high pressure sealing ball (9) and fuel tap spring (11), be communicated with high pressure fuel passage (12).
2. high pressure shared-rail oil jetting pump switch valve as claimed in claim 1, it is characterized in that, high pressure sealing ball 9 gos deep into switch valve (7) ear end face center ball-and-socket, falling into oil outlet valve spring (11) spring end is connected, with switch valve (7) stack separated connected delivery connection (13), by high pressure sealing ball (9) and fuel tap spring (11), be communicated with high pressure fuel passage (12).
3. high pressure shared-rail oil jetting pump switch valve as claimed in claim 1, it is characterized in that, when oily rail needs fuel oil to inject, low-voltage fuel channel pressure raises, coordinate plunger descending, fuel oil is pushed one-way valve open and is entered in plunger cavity, and when plunger is up, fuel oil is compressed, fuel pressure in plunger cavity is during higher than fuel pressure in oily rail, the one-way valve high pressure sealing ball (10) of high pressure fuel passage (12) is opened, and fuel oil enters in oily rail, the fuel oil of postinjection and leakage.
4. high pressure shared-rail oil jetting pump switch valve as claimed in claim 1, it is characterized in that, during plunger (2) oil pumping, the pressure of low-voltage fuel passage (1) is pushed low pressure seal ball (7) open together in conjunction with the negative pressure in plunger cavity (5), enter plunger cavity (5), low pressure seal ball (6) is opened under the acting in conjunction of low-voltage fuel passage (1) and plunger cavity (5) internal pressure.
5. high pressure shared-rail oil jetting pump switch valve as claimed in claim 1, it is characterized in that, during plunger (2) compression fuel oil, plunger cavity (5) is by plunger (2) compression fuel oil, low pressure seal ball (6) is under the spring-force driven dual of oiling valve spring (4), make low pressure seal ball (7) return, form conical surface seal with switch valve (7), fuel oil enters switch valve oil discharge passage (9).
6. high pressure shared-rail oil jetting pump switch valve as claimed in claim 1, it is characterized in that, pressure in plunger cavity (5) is during higher than pressure in high pressure fuel passage (12), and high pressure sealing ball (10) is in the lower unlatching of oil outlet valve spring (11) effect, and fuel oil enters high pressure fuel passage (12).
7. high pressure shared-rail oil jetting pump switch valve as claimed in claim 1, it is characterized in that, when plunger cavity (5) and high pressure fuel passage (12) isostasy, under the spring-force driven dual of oil outlet valve spring (11), high pressure sealing ball (10) return, sealed plunger chamber (5) and high pressure fuel passage (12).
8. high pressure shared-rail oil jetting pump switch valve as claimed in claim 1, it is characterized in that, guarantee sealing between switch valve (7) and the pump housing (3) and the sealing between switch valve (7) and high pressure sealing ball (10) in order to work, switch valve (7) is plane sealing with the pump housing (3), between switch valve (7) and high pressure sealing ball (10), is conical surface seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320544937.6U CN203532126U (en) | 2013-09-03 | 2013-09-03 | Switching valve of high-pressure common-rail fuel injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320544937.6U CN203532126U (en) | 2013-09-03 | 2013-09-03 | Switching valve of high-pressure common-rail fuel injection pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203532126U true CN203532126U (en) | 2014-04-09 |
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ID=50418341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320544937.6U Expired - Fee Related CN203532126U (en) | 2013-09-03 | 2013-09-03 | Switching valve of high-pressure common-rail fuel injection pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203532126U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089529A (en) * | 2016-08-29 | 2016-11-09 | 无锡威孚高科技集团股份有限公司 | The pump oil system of common-rail high-pressure pump |
| CN107407273A (en) * | 2015-01-05 | 2017-11-28 | 康明斯公司 | Fuel pump pumping element |
-
2013
- 2013-09-03 CN CN201320544937.6U patent/CN203532126U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107407273A (en) * | 2015-01-05 | 2017-11-28 | 康明斯公司 | Fuel pump pumping element |
| US20180156175A1 (en) * | 2015-01-05 | 2018-06-07 | Cummins Inc. | High pressure diesel fuel pump pumping element |
| CN107407273B (en) * | 2015-01-05 | 2019-04-12 | 康明斯公司 | Fuel pump pumping element |
| US11421637B2 (en) * | 2015-01-05 | 2022-08-23 | Cummins Inc. | High pressure diesel fuel pump pumping element |
| CN106089529A (en) * | 2016-08-29 | 2016-11-09 | 无锡威孚高科技集团股份有限公司 | The pump oil system of common-rail high-pressure pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20200903 |