CN203239480U - High-pressure fuel pump - Google Patents
High-pressure fuel pump Download PDFInfo
- Publication number
- CN203239480U CN203239480U CN 201320234119 CN201320234119U CN203239480U CN 203239480 U CN203239480 U CN 203239480U CN 201320234119 CN201320234119 CN 201320234119 CN 201320234119 U CN201320234119 U CN 201320234119U CN 203239480 U CN203239480 U CN 203239480U
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- Prior art keywords
- plunger
- high pressure
- fuel pump
- pressure fuel
- oil
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Abstract
Provided is a high-pressure fuel pump. The high-pressure fuel pump comprises a high pressure assembly and a driven device. The high pressure assembly comprises a plunger sleeve, a plunger and a one-way valve device, wherein a valve installing chamber and a plunger chamber are defined by the plunger sleeve, and are communicated with the each other, the plunger can be driven by the driven device to carry out reciprocating movement in the plunger chamber, the one-way valve device is installed in the valve installing chamber so that a pressurization cavity which is formed in the plunger chamber can be defined between the one-way valve device and one end, close to the one-way valve device, of the plunger, an oil supply hole is formed in the plunger sleeve, and fuel oil can be sucked into the pressurization cavity through the oil supply hole and the one-way valve device. Sealing elements which prevent the fuel oil in the pressurization cavity from leakage are arranged in the high pressure assembly, and are arranged between the outer circumferential surface of the plunger and the inner circumferential surface of the plunger sleeve. Correspondingly, the high-pressure fuel pump can achieve the technical effect of preventing the fuel oil sucked into the pressurization cavity from leaking along a gap formed between the plunger and the plunger sleeve.
Description
Technical field
The utility model relates to a kind of high pressure fuel pump, a kind of high pressure fuel pump for internal-combustion engine particularly, and wherein, the high potential assembly of described high pressure fuel pump is provided with seal element, to prevent that fuel oil is at the internal leakage of high potential assembly.
Background technique
Internal-combustion engine (for example diesel engine) generally includes low-pressure fuel pump, high pressure fuel pump, manifold, low-pressure fuel pump is connected to the low pressure supply pipeline of high pressure fuel pump and the high pressure delivery pipes that high pressure fuel pump is connected to manifold or " altogether rail ".
High pressure fuel pump generally includes driven device and the high potential assembly that fits together.By making driving mechanism drive driven device, will be supplied to high potential assembly from the fuel oil of low-pressure fuel pump, high potential assembly pressurizes fuel oil again.Usually, the high potential assembly of this high pressure fuel pump has oil trap and leaks oily discharge passage, with the fuel oil of the internal leakage that is collected in high potential assembly.
In the prior art, these leakage fuel oils that are collected can be by mixing with the fuel oil of low-pressure fuel pump supply and again being pressurizeed by high potential assembly again.Yet, because these leakage fuel oils that are collected heated up in the pressure process in the first time, cause it to affect the viscosity of mixed fuel oil and make the reduced viscosity of mixed fuel oil, thereby these mixed fuel oils leakage rate when being pressurizeed by high potential assembly can increase, and forms vicious circle.
In addition, the leakage fuel oil that these are collected also can all return fuel tank, thus the possibility of avoiding these leakage fuel oils that are collected under high temperature condition, to be repeated immediately to pressurize.
Yet, these two kinds of embodiments require in the high potential assembly of high pressure fuel pump and other associated components baroque fuel gallery to be set, especially also be provided with in the situation of fuel gallery of other purposes at high potential assembly, this will cause the complicate fabrication process of high pressure fuel pump.
In addition, a small amount of fuel oil that leaks also may further flow to driving mechanism, and mixes with the lubricant oil that is used for driving mechanism, thereby damages purity and the quality of described lubricant oil, so that lubricant oil need to often be replaced.
Simultaneously, if fuel oil strengthens at the internal leakage of high potential assembly, will reduce the working efficiency of pump, this is unfavorable for the normal operation of internal-combustion engine.
The model utility content
The purpose of this utility model provides a kind of high fuel oil press pump, particularly a kind of high pressure fuel pump for internal-combustion engine, and it can prevent fuel oil at the internal leakage of high potential assembly, thereby improves the working efficiency of high pressure fuel pump.
In order to realize this purpose, provide a kind of high pressure fuel pump according to the utility model, it comprises: high potential assembly, it receives fuel oil and described fuel oil is pressurized to high pressure; And driven device, it is driven by driving mechanism; Wherein, described high potential assembly comprises: plunger bushing, and it limits valve installation room and the plunger compartment that communicates with each other; Plunger, it can be driven to move back and forth in described plunger compartment by described driven device; Check valve apparatus, it is installed in the described valve installation room, thereby limits the pressurizing chamber that is arranged in described plunger compartment between an end of the close described check valve apparatus of described check valve apparatus and described plunger; Described plunger bushing is provided with oil supply hole, and described fuel oil energy is inhaled in the described pressurizing chamber via described oil supply hole and described check valve apparatus; It is characterized in that, be provided with the seal element that prevents the fuel leakage in the described pressurizing chamber in described high potential assembly, described seal element is arranged between the inner peripheral surface of the outer circumferential face of described plunger and described plunger bushing.
According to a preferred embodiment of the present utility model, described seal element is arranged on the outer circumferential face of plunger, and slidably against the inner peripheral surface of plunger bushing with the gap between the inner peripheral surface of the outer circumferential face that seals described plunger and described plunger bushing.
According to a preferred embodiment of the present utility model, described seal element is arranged on the outer circumferential face of close described pressurizing chamber of plunger.
According to a preferred embodiment of the present utility model, described seal element is arranged on the inner peripheral surface of plunger bushing, and slidably against the outer circumferential face of plunger with the gap between the inner peripheral surface of the outer circumferential face that seals described plunger and described plunger bushing.
According to a preferred embodiment of the present utility model, described seal element is made by elastic material or non-elastic material or composite material that both form.
According to a preferred embodiment of the present utility model, described seal element is O type circle.
According to a preferred embodiment of the present utility model, described seal element is a plurality of.
According to a preferred embodiment of the present utility model, at least one in described a plurality of seal elements is arranged on the outer circumferential face of close described pressurizing chamber of plunger
According to a preferred embodiment of the present utility model, described plunger bushing also is provided with around the inner peripheral surface of plunger and collects the annular oil trap of the leakage fuel oil in the described pressurizing chamber.
According to a preferred embodiment of the present utility model, described plunger bushing also is provided with the leakage oil discharge passage of discharging with described annular oil sump and fuel oil that described annular oil trap is collected.
Technique effect of the present utility model is, the structure of the high potential assembly of described high pressure fuel pump can be simplified, therefore the manufacture process of high potential assembly becomes simple, owing to there is no fuel oil energy from the internal leakage of high potential assembly, this can improve the working efficiency of high pressure fuel pump simultaneously.In addition, in the situation that use seal element, there is no that fuel oil can be owing to leaking the lubricant oil that is mixed into for plunger actuation mechanism, this helps to keep purity and the quality of lubricant oil.
Description of drawings
Fig. 1 is the partial sectional view according to an embodiment's of the present utility model high pressure fuel pump.
Fig. 2 is the broken section enlarged view of the high pressure fuel pump of Fig. 1.
Fig. 3 is the partial cutaway zoomed-in view according to again another embodiment's of the present utility model high pressure fuel pump.
Fig. 4 is the partial sectional view according to again another embodiment's of the present utility model high pressure fuel pump.
In different views, identical parts can represent with identical reference character, and will omit the unnecessary description to these parts.
Embodiment
In high pressure fuel pump of the present utility model, an end of the close check valve apparatus of plunger is defined as the front end of plunger, plunger is defined as the rear end of plunger away from an end of check valve apparatus; Plunger is defined as towards the movement of check valve apparatus advances, with plunger away from the running fix of check valve apparatus for retreating.
Schematically show the partial sectional view according to an embodiment's of the present utility model high pressure fuel pump among Fig. 1, wherein high potential assembly 2 is used for will pressurizeing from the fuel oil of low-pressure fuel pump (not shown) and being fed to common rail (not shown), especially, described high potential assembly 2 is plunger types.Thus, described high potential assembly 2 mainly comprises: be installed in the plunger bushing 20 in the plunger bushing housing 5, have the valve installation room and plunger compartment (not the marking in the drawings) that communicate with each other in described plunger bushing 20 inside; The plunger 22 that in described plunger compartment, moves back and forth; Be installed in the check valve apparatus 24 in the described valve installation room, limit the pressurizing chamber 26 that is arranged in described plunger compartment by the front end of described check valve apparatus 24 and described plunger 22; Drive the driven device 28 that described plunger 22 moves back and forth, described driven device 28 is for example driven by driving mechanism; Be installed in check valve apparatus 24 with respect to the delivery connection 23 of the opposition side of plunger 22, described delivery connection 23 is used for high pressure fuel from high potential assembly 2 outputs.
The assembly that check valve apparatus 24 can be comprised of two one-way valves, one of them one-way valve allow fuel oil to flow into the pressurizing chambers 26 from oil supply hole 30, but do not allow described fuel oil to be back in the oil supply hole 30 from pressurizing chamber 26; Another one-way valve allows fuel oil to discharge and be fed to the common rail via delivery connection 23 from pressurizing chamber 26, but the fuel flow returns that does not allow to have discharged is in pressurizing chamber 26.The check valve apparatus 24 of this function is as known in the art, and is easy to design various structures, therefore is not described in detail.
When for example being the driving mechanism rotation of actuated by cams axle, in the process of force feed stroke, the cam lobe on the camming surface of cam raises cam driven device 28 and drives plunger 22 by cam driven device 28 advances in the plunger compartment; In the process of return stroke, cam lobe turns over cam driven device 28, and spring 56 actuating cam driven devices 28 fall to the depression position of camming surface, thereby plunger 22 retreats in the plunger compartment, and like this, cam actuated plunger 22 moves back and forth in the plunger compartment.Under state shown in Figure 1, the plunger 22 in the high potential assembly 2 is positioned at the top dead center of its stroke, and namely the volume of pressurizing chamber 26 is positioned at minimum value.
The quantity of high potential assembly 2 is at least one, but in order to reduce the fluctuation of charge oil pressure, is preferably two or more.Preferably, the quantity of high potential assembly 2 equals the quantity of cam, and at this moment, driving mechanism drives a plurality of high potential assemblies 2 simultaneously.In addition, described a plurality of high potential assembly 2 can have identical or different structure.
Especially, plunger bushing housing 5 is preferably the casting shell, and described plunger bushing housing 5 can be made for integral piece, also can be formed by a plurality of parts that fit together.
In the process of the return stroke of plunger 22, described plunger 22 retreats, cause pressurizing chamber 26 volumes to increase, thereby pass through the supply oil duct in the plunger bushing housing 5, oil supply hole 30 and the check valve apparatus 24 inflow fueling cavities 26 of plunger bushing 20 from the fuel oil of low-pressure fuel pump.
In the process of the force feed stroke of plunger 22, described plunger 22 advances, and cause pressurizing chamber 26 volumes to reduce, thereby the fuel oil in the pressurizing chamber 26 is pressurizeed and discharges in the direction of arrow F by check valve apparatus 24 and delivery connection by plunger 22.In the force feed stroke, because the pressure in the pressurizing chamber 26 is very high, therefore has a small amount of fuel oil and leak along the direction of the rear end of plunger 22 from outer circumferential face and the gap between plunger bushing 20 inner peripheral surfaces of plunger 22.
For this reason, seal element 40 can be set in high potential assembly 2.Like this, in the process of force feed stroke, because seal element 40 stops that pressurization fuel oil leaks in the outer circumferential face and the gap between plunger bushing 20 inner peripheral surfaces of plunger 22, can prevent fuel oil from flowing to the rear end of plunger 22 and mix with the lubricant oil of driving mechanism, also can improve the working efficiency of high pressure fuel pump simultaneously.
Schematically show the broken section enlarged view of the high pressure fuel pump of Fig. 1 among Fig. 2.As shown in Figure 2, preprocessing has circular groove (marking) on the outer circumferential face of described plunger 22 in Fig. 2, and its preferred orientation becomes the front end near plunger 22.Described seal element 40 is then by being fixed on the plunger 22 in the circular groove on the outer circumferential face that is assembled in plunger 22, and described seal element 40 is by sealing gap between the inner peripheral surface of the outer circumferential face of described plunger 22 and described plunger bushing 20 against plunger bushing 20 slidably.In addition, seal element 40 also can be fixed to plunger 22 by alternate manner.
As shown in Figure 3, seal element 40 also can be arranged on the inner peripheral surface of plunger bushing 20, and described seal element 40 is by sealing gap between the inner peripheral surface of the outer circumferential face of described plunger 22 and described plunger bushing 20 against plunger 22 slidably.Similarly, described seal element 40 is by being fastened on the plunger 22 in the circular groove (marking in Fig. 3) that is assembled in plunger bushing 20 inner peripheral surfaces.Guarantee plunger 22 in the process of return stroke or pressure stroke all the time with condition that seal element 40 contacts under, described circular groove preprocessing is on the inner peripheral surface of plunger bushing 20.In addition, seal element 40 also can be fixed to plunger bushing 20 by alternate manner.
Alternatively, seal element 40 can be made by elastic material, and described elastic material can work under the condition of high pressure and high temperature, and less than normal with the friction factor of plunger bushing 20 inner peripheral surfaces, thereby does not affect plunger 22 moving back and forth in plunger bushing 20.Do not affecting under the condition that moves back and forth of plunger 22 in plunger bushing 20, seal element 40 also can be made by non-elastic material, perhaps made the laminate of for example being made by elastic material and non-elastic material by the composite material that forms of elastic material and non-elastic material.
Alternatively, one or more seal elements 40 can be set in high potential assembly 2, and described seal element 40 can be O type circle or other seal arrangement.When seal element 40 quantity when being a plurality of, these seal elements 40 can be arranged in the high potential assembly 2 with various compound modes.
According to an embodiment, identical or different a plurality of seal elements 40 evenly or unevenly can be arranged on the outer circumferential face of plunger 22, accordingly, can on the outer circumferential face of plunger 22, preprocessing go out a plurality of circular grooves, to assemble described a plurality of seal element 40.Preferably, these seal elements 40 are scattered in the front end near plunger 22.
According to another embodiment, can evenly or unevenly be arranged on identical or different a plurality of seal elements 40 on the inner peripheral surface of plunger bushing 20; Accordingly, can on the inner peripheral surface of plunger bushing 20, preprocessing go out a plurality of circular grooves, to assemble described a plurality of seal element 40.Wherein, at least one in these seal elements 40 in the process of the return stroke of plunger 22 or pressure stroke all the time slidably against plunger 22, with the gap between the inner peripheral surface of the outer circumferential face that seals all the time described plunger 22 and described plunger bushing 20.
According to another embodiment, identical or different a plurality of seal elements 40 evenly or unevenly can be separately positioned on the outer circumferential face of plunger 22 and on the inner peripheral surface of plunger bushing 20, accordingly, can be respectively on the inner peripheral surface of the outer circumferential face of plunger 22 and plunger bushing 20 preprocessing go out a plurality of circular grooves, to assemble described a plurality of seal element 40.Wherein, be arranged on the seal element 40 on the outer circumferential face of plunger 22 and the seal element 40 that is arranged on the inner peripheral surface of plunger bushing 20 can not interfere with each other all the time in the process of the return stroke of plunger 22 or pressure stroke.
Fig. 4 schematically shows the partial sectional view according to another embodiment's of the present utility model high pressure fuel pump.Wherein, in order further to prevent fuel oil from the outer circumferential face of plunger 22 and the clearance leakage between plunger bushing 20 inner peripheral surfaces, can be additionally oil trap 32 be set and leads to the leakage oil discharge passage 34 of plunger bushing 20 peripheries from oil trap 32 at plunger bushing 20.Corresponding leakage oil circulation canal 36 in leaking oily discharge passage 34 and being formed on plunger bushing housing 5 is communicated with, and leaks oily circulation canal 36 and then leads to the supply oil duct.Like this, the fuel oil that leaks along the outer circumferential face of plunger 22 is collected in the oil trap 32.When plunger 22 retreats in return stroke, because the pressure decreased in the pressurizing chamber 26, the fuel oil of leakage can be through leaking oily discharge passage 34, leak oily circulation canal 36, supplying with oil duct and flow in the oil supply hole 30 and mix with fuel oil that oil feed pump is supplied with and again enter in the pressurizing chamber 26.Alternatively, the fuel oil of leakage also can flow back to fuel tank through leaking oily discharge passage 34, the oily circulation canal 36 of leakage and other respective channel.
The above is described a plurality of embodiments of the present utility model, but the utility model is not intended to be limited to the embodiment of top description and accompanying drawing signal.The feature of describing about an embodiment is equally applicable to other embodiment of the present utility model, and different embodiments' feature can mutually combine and form new embodiment.In the situation that does not depart from the essence that limited by following claim and scope, those skilled in the art can carry out various modifications and variation to above-described embodiment.
Claims (10)
1. high pressure fuel pump comprises:
High potential assembly, it receives fuel oil and described fuel oil is pressurized to high pressure; With
Driven device, it is driven by driving mechanism;
Wherein, described high potential assembly comprises: plunger bushing, and it limits valve installation room and the plunger compartment that communicates with each other; Plunger, it can be driven to move back and forth in described plunger compartment by described driven device; Check valve apparatus, it is installed in the described valve installation room, thereby limits the pressurizing chamber that is arranged in described plunger compartment between an end of the close described check valve apparatus of described check valve apparatus and described plunger;
Described plunger bushing is provided with oil supply hole, and described fuel oil energy is inhaled in the described pressurizing chamber via described oil supply hole and described check valve apparatus;
It is characterized in that, be provided with the seal element that prevents the fuel leakage in the described pressurizing chamber in described high potential assembly, described seal element is arranged between the inner peripheral surface of the outer circumferential face of described plunger and described plunger bushing.
2. high pressure fuel pump as claimed in claim 1 is characterized in that, described seal element is arranged on the outer circumferential face of plunger, and slidably against the inner peripheral surface of plunger bushing with the gap between the inner peripheral surface of the outer circumferential face that seals described plunger and described plunger bushing.
3. high pressure fuel pump as claimed in claim 2 is characterized in that, described seal element is arranged on the outer circumferential face of close described pressurizing chamber of plunger.
4. high pressure fuel pump as claimed in claim 1 is characterized in that, described seal element is arranged on the inner peripheral surface of plunger bushing, and slidably against the outer circumferential face of plunger with the gap between the inner peripheral surface of the outer circumferential face that seals described plunger and described plunger bushing.
5. such as the described high pressure fuel pump of one of claim 1-4, it is characterized in that, described seal element is made by elastic material or non-elastic material.
6. high pressure fuel pump as claimed in claim 5 is characterized in that, described seal element is O type circle.
7. high pressure fuel pump as claimed in claim 1 is characterized in that, described seal element is a plurality of.
8. high pressure fuel pump as claimed in claim 7 is characterized in that, at least one in described a plurality of seal elements is arranged on the outer circumferential face of close described pressurizing chamber of plunger.
9. high pressure fuel pump as claimed in claim 1 is characterized in that, described plunger bushing also is provided with around the inner peripheral surface of plunger and collects the annular oil trap of the leakage fuel oil in the described pressurizing chamber.
10. high pressure fuel pump as claimed in claim 9 is characterized in that, described plunger bushing also is provided with the leakage oil discharge passage of discharging with described annular oil sump and fuel oil that described annular oil trap is collected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320234119 CN203239480U (en) | 2013-05-03 | 2013-05-03 | High-pressure fuel pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320234119 CN203239480U (en) | 2013-05-03 | 2013-05-03 | High-pressure fuel pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203239480U true CN203239480U (en) | 2013-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320234119 Expired - Lifetime CN203239480U (en) | 2013-05-03 | 2013-05-03 | High-pressure fuel pump |
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| CN (1) | CN203239480U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026387A (en) * | 2018-09-05 | 2018-12-18 | 常熟瑞特电气股份有限公司 | A kind of fuel leakage early warning system of diesel engine delivery valve |
-
2013
- 2013-05-03 CN CN 201320234119 patent/CN203239480U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026387A (en) * | 2018-09-05 | 2018-12-18 | 常熟瑞特电气股份有限公司 | A kind of fuel leakage early warning system of diesel engine delivery valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131016 |
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| CX01 | Expiry of patent term |