CN201255062Y - High-pressure co-rail injection pump for diesel engine - Google Patents
High-pressure co-rail injection pump for diesel engine Download PDFInfo
- Publication number
- CN201255062Y CN201255062Y CNU200820132189XU CN200820132189U CN201255062Y CN 201255062 Y CN201255062 Y CN 201255062Y CN U200820132189X U CNU200820132189X U CN U200820132189XU CN 200820132189 U CN200820132189 U CN 200820132189U CN 201255062 Y CN201255062 Y CN 201255062Y
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- China
- Prior art keywords
- pressure
- limiting valve
- pressure limiting
- pump
- valve body
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- Expired - Lifetime
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Abstract
The utility model discloses a high-pressure common-rail fuel injection pump for a diesel engine, which comprises a pump body, wherein, a fuel pipeline is arranged in the pump body, a pressure limiting valve is installed above the pump body, and the pressure limiting valve is communicated with the fuel pipeline. The pressure limiting valve comprises a pressure limiting valve body; a communicated channel is arranged in the pressure limiting valve body and is communicated with the fuel pipeline; a pressure limiting valve spring and a pressure limiting valve core are installed in the channel, and a plug screw is screwed on the upper end opening of the channel. The utility model has the advantages of convenient installation, good leak tightness,and convenient processing and control. The utility model can meet the requirements of Chinese emission standards III and IV.
Description
Technical field
The utility model relates to the high pressure oil pump in a kind of fuel oil supply system, relates in particular to a kind of fuel delivery high pressure oil pump of joint-track type.
Background technique
At present, in the diesel engine fuel oil supply system, generally use high pressure shared-rail oil jetting pump.Require product must meet technical specifications such as high-pressure tightness is good, speed of response is fast, the oily efficient height of pump, difficult heating.In existing technology, the structure that high pressure shared-rail oil jetting pump adopts is that low pressure oil transfer pump and high-pressure service pump are integrated, the low pressure oil transfer pump is a blade type, by camshaft actuated, controls under by the effect of pressure regulation valve coupling (similar plunger coupled parts) at spring force through the pressure control of the fuel oil after the oil transfer pump pressurization.The deficiency that such structural design exists is: the fuel pressure pressure regulator valve is installed in the deep hole of the pump housing behind the oil transfer pump, and four sealing part are arranged between the pressure regulator valve and the pump housing, and have following point: 1, finish surface is many, and difficulty of processing is big; 2, sealing is difficult for guaranteeing; 3, the adjustment of the cracking pressure of adjusting pressuring valve core guarantees not have the link of adjustment by the machining accuracy of each part; 4, part is many, if tightness goes wrong, the tension that O shape circle distortion back produces makes part not quick detachable.
Summary of the invention
The purpose of this utility model provides the high pressure shared-rail oil jetting pump that a kind of easy for installation, good airproof performance, processing and control are convenient, satisfy the diesel engine of state III, state IV emission standard.
The high pressure shared-rail oil jetting pump of a kind of diesel engine of the present utility model comprises the pump housing, is provided with fuel pipe in the described pump housing, above the described pump housing pressure-limit valve is installed, and described pressure-limit valve and described fuel pipe are connected.
Wherein, described pressure-limit valve comprises the pressure limiting valve body, offers the passage that runs through in described pressure limiting valve body, and described passage is connected with described fuel pipe, limiting valve spring and pressure limiting spool are installed in described passage, and a plug screw is tightened in the upper end-hole place of described passage.
Between described plug screw and described limiting valve spring, be provided with the adjustment pad.
Between the upper surface of the nut of described plug screw and pressure limiting valve body, be provided with gasket seal.
Between described pressure limiting valve body and the described pressure limiting spool, between described plug screw and the pressure limiting valve body and described pressure limiting valve body and the pump housing install that surface of contact is sealing surface between the end face.
In the described pump housing, be provided with integrated low pressure oil supply structure and high-pressure service pump structure.
Owing to adopt the said structure design, the utlity model has following beneficial effect:
1, finish surface reduces, and technology difficulty reduces;
2, number of parts reduces;
3, installation and removal are convenient;
4, increased the adjustment link, the cracking pressure of pressure-limit valve can be adjusted;
5, sealing easily guarantees.
Description of drawings
Fig. 1 is the high pressure shared-rail oil jetting pump overall structure schematic representation of the utility model diesel engine;
Fig. 2 is the structure sectional view of pressure-limit valve of the high pressure shared-rail oil jetting pump of the utility model diesel engine.
Mark the following drawings mark thereon in conjunction with the accompanying drawings:
1-pressure limiting valve body; The 2-plug screw; The 3-gasket seal; 4-adjusts pad; The 5-limiting valve spring;
6-pressure limiting spool; The 7-pump housing; The 8-fuel pipe.
Embodiment
Further specify the specific embodiment of the high pressure shared-rail oil jetting pump of the diesel engine that the utility model provides below in conjunction with accompanying drawing.
As shown in Figure 1, the high pressure shared-rail oil jetting pump of the utility model diesel engine comprises the pump housing 7, is provided with integrated low pressure oil supply structure and high-pressure service pump structure in the pump housing 7.Be provided with fuel pipe 8 in the pump housing 7, pressure limiting valve body and fuel pipe 8 connected, the switching process of the overflow hole by the pressure limiting valve body, being communicated with and disconnection of the oil duct that control fuel pipe and oil transfer pump are preceding.
As shown in Figure 2, pressure-limit valve comprises pressure limiting valve body 1, offers the passage that runs through in pressure limiting valve body 1, and passage is connected with fuel pipe 8, and limiting valve spring 5 and pressure limiting spool 6 are installed in passage, and plug screw 2 is tightened in the upper end-hole place of passage, with channel seal.
Between plug screw 2 and limiting valve spring 5, be provided with and adjust pad 4.Adjust the cracking pressure of pressure-limit valve by adjusting pad 4.
Between the upper surface of the nut of plug screw 2 and pressure limiting valve body 1, be provided with gasket seal 3, strengthen sealing between the two.Between pressure limiting valve body 1 and the pressure limiting spool 6, between plug screw 2 and the pressure limiting valve body 1 and pressure limiting valve body 1 and the pump housing install that surface of contact is sealing surface between the end face.
In use, fuel pressure increases after the camshaft speed increase makes oil transfer pump, and when surpassing the pretightening force of limiting valve spring, the pressure limiting spool is promoted by fuel oil, and fuel oil is got back in the oil duct before the oil transfer pump by the oil spilling hole on the pressure limiting valve body; Fuel pressure descends after camshaft speed decline makes oil transfer pump, and the pressure limiting spool is taken a seat under the effect of limiting valve spring power, closes the oil spilling hole.
The utility model has reduced the quantity of sealing surface.Sealing surface between the sealing surface of the pump housing, pressure limiting valve body and the plug screw externally, be convenient to processing and control, the technological method of the sealing part of pressure limiting valve body and pressure limiting spool also is easy to realize, has increased the adjustment link, adjusts the cracking pressure of pressure-limit valve by adjusting pad.Whole pressure-limit valve parts directly are screwed into the pump housing with screw thread, are convenient to installation and removal.
More than disclosed only be a specific embodiment of the present utility model, but the utility model is not limited thereto, any those skilled in the art can think variation all should fall into protection domain of the present utility model.
Claims (6)
1. the high pressure shared-rail oil jetting pump of a diesel engine comprises the pump housing, is provided with fuel pipe in the described pump housing, it is characterized in that, above the described pump housing pressure-limit valve is installed, and described pressure-limit valve and described fuel pipe are connected.
2. the high pressure shared-rail oil jetting pump of diesel engine according to claim 1, it is characterized in that, described pressure-limit valve comprises the pressure limiting valve body, in described pressure limiting valve body, offer the passage that runs through, described passage is connected with described fuel pipe, limiting valve spring and pressure limiting spool are installed in described passage, and a plug screw is tightened in the upper end-hole place of described passage.
3, the high pressure shared-rail oil jetting pump of diesel engine according to claim 2 is characterized in that, is provided with the adjustment pad between described plug screw and described limiting valve spring.
4, according to the high pressure shared-rail oil jetting pump of claim 2 or 3 described diesel engines, it is characterized in that, between the upper surface of the nut of described plug screw and pressure limiting valve body, be provided with gasket seal.
5, the high pressure shared-rail oil jetting pump of diesel engine according to claim 2, it is characterized in that, between described pressure limiting valve body and the described pressure limiting spool, between described plug screw and the pressure limiting valve body and described pressure limiting valve body and the pump housing install that surface of contact is sealing surface between the end face.
6, the high pressure shared-rail oil jetting pump of diesel engine according to claim 1 is characterized in that, is provided with integrated low pressure oil supply structure and high-pressure service pump structure in the described pump housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820132189XU CN201255062Y (en) | 2008-08-04 | 2008-08-04 | High-pressure co-rail injection pump for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820132189XU CN201255062Y (en) | 2008-08-04 | 2008-08-04 | High-pressure co-rail injection pump for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201255062Y true CN201255062Y (en) | 2009-06-10 |
Family
ID=40738378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820132189XU Expired - Lifetime CN201255062Y (en) | 2008-08-04 | 2008-08-04 | High-pressure co-rail injection pump for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201255062Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105508098A (en) * | 2016-01-11 | 2016-04-20 | 浙江环球滤清器有限公司 | Pressure regulating device of fuel filter assembly |
| CN105526034A (en) * | 2016-01-11 | 2016-04-27 | 浙江环球滤清器有限公司 | Pressure regulating type fuel oil filter assembly |
| CN111396222A (en) * | 2020-04-30 | 2020-07-10 | 北油电控燃油喷射系统(天津)有限公司 | High pressure of adjustable pressure and flow is defeated oil pump for rail altogether |
-
2008
- 2008-08-04 CN CNU200820132189XU patent/CN201255062Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105508098A (en) * | 2016-01-11 | 2016-04-20 | 浙江环球滤清器有限公司 | Pressure regulating device of fuel filter assembly |
| CN105526034A (en) * | 2016-01-11 | 2016-04-27 | 浙江环球滤清器有限公司 | Pressure regulating type fuel oil filter assembly |
| CN111396222A (en) * | 2020-04-30 | 2020-07-10 | 北油电控燃油喷射系统(天津)有限公司 | High pressure of adjustable pressure and flow is defeated oil pump for rail altogether |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090610 |