CN2031040U - Fuel-injection pump for internal combustion engines - Google Patents
Fuel-injection pump for internal combustion engines Download PDFInfo
- Publication number
- CN2031040U CN2031040U CN 88202474 CN88202474U CN2031040U CN 2031040 U CN2031040 U CN 2031040U CN 88202474 CN88202474 CN 88202474 CN 88202474 U CN88202474 U CN 88202474U CN 2031040 U CN2031040 U CN 2031040U
- Authority
- CN
- China
- Prior art keywords
- tappet
- hole
- cam
- pin
- positioning block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 7
- 238000002347 injection Methods 0.000 title abstract description 18
- 239000007924 injection Substances 0.000 title abstract description 18
- 239000000446 fuel Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract 1
- 210000003141 lower extremity Anatomy 0.000 description 9
- 238000005086 pumping Methods 0.000 description 4
- 230000036461 convulsion Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model relates to a fuel injection pump for internal combustion engines, which improves on the structure of a fuel injection pump body and a tappet locating mode. The utility model is characterized in that a circular hole perpendicular to a tappet hole is arranged on the wall of the tappet hole, a columnar locating block is installed, the end face of the locating block is used for controlling the end face of a pin hole on a tappet, which causes the tappet not to rotate, and simultaneously, when the cam lift is increased, the centerline of a roller pin is in the range of the locating block. Consequently, the utility model has the advantages of compact structure of the pump body and the tappet, easy fabrication, long service life, good stress and small abrasion.
Description
The utility model relates to internal combustion (IC) engine oil-jetting pump, particularly relates to a kind of diesel engine jerk fuel injection pump, is a kind of improvement to existing oil jet pump body structure and tappet orientation type.
The internal combustion (IC) engine oil-jetting pump of generally using both at home and abroad mainly is a jerk fuel injection pump at present, comprises the pump housing, camshaft, roller tappet parts and one or more groups pump element, and the cam hole in the pump housing is made the through hole of radius greater than cam tip circle radius.To-and-fro motion in the tappet hole of tappet on the pump housing is floated in the pin-and-hole of roller pin on tappet.The Minimec-9 Injection Pump of Britain Lucas Xi Aiwei company (Lucas CAV Ltd) is in order to improve injection rate, strengthen the ability to work of Injection Pump, strengthened cam lift, when cam is positioned at lower dead center the roller pin center line exceed 1 millimeter of tappet hole lower limb (see SAE paper SAE780769 and July nineteen eighty-two Wuxi oil pump oil chew research institute's " CR2-4100 diesel engine with CAV fuel injection system structural analysis report ").The project organization of the like product BW type Injection Pump of domestic production is identical therewith.
In addition, rotate when preventing that tappet from pumping, guider screw or positioning plate are installed on the pump housing usually.But above-mentioned tappet orientation type especially realizes than difficult on triplex pump or five cylinder pumps on the in-line fuel injection pump of physical dimension compactness especially.
Wuxi oil pump oil is chewed research institute and has been proposed a kind of cam hole in the pump housing to be made the structure of shoulder hole in utility model patent CN86208831, makes cam lift strengthen the rear roller pin center and does not exceed tappet hole lower limb.But this patent does not relate to the orientation type of tappet.
The purpose of this utility model provides a kind of improved internal combustion (IC) engine oil-jetting pump pump body structure and tappet orientation type, make when cam lift strengthens, though the roller pin center line exceeds tappet hole lower limb, the end face of roller pin can not wiped mutually with tappet hole lower limb.Simultaneously can also prevent to rotate when tappet from pumping.
Technological points of the present utility model is: making a diameter on each the tappet hole wall in the pump housing is D
2, the circular hole vertical with the tappet hole, respectively adorning a diameter in the circular hole is D
2Positioning block.The end face of positioning block cooperates with pin-and-hole end face on the tappet, and can slide relative.Should control the pin-and-hole length overall on the tappet for this reason, promptly between the pin-and-hole both ends of the surface apart from F, prevent to rotate when tappet from pumping.The thickness of positioning block has two kinds.The thickness that is positioned at the positioning block (3) of pump housing rear end is B
1, B
1Should less than last cylinder center to the distance C of ear end face M and the pin-and-hole length overall F on the tappet half poor, i.e. B
1＜C-F/2.The thickness of all the other each positioning blocks (9) is B, and what B should be less than the pin-and-hole length overall F on cylinder core distance A and the tappet is poor, i.e. B＜A-F.When guaranteeing that tappet pumps, the roller pin center line can not exceed the scope of positioning block, positioning block diameter D
2Should be greater than cam tip circle radius poor, i.e. D
2＞R
1-R
0, when cam is positioned at lower dead center, not exceeding the scope of positioning block in order to guarantee the roller pin center line, the distance H at the cam hole center of positioning block center to the pump housing should be less than radius of cam base-circle, roller radius and positioning block radius sum, that is: H＜R
0+ (d/2)+(D
2/ 2).
The utility model compared with prior art, therefore the advantage that is had is: the cam lift of Injection Pump can strengthen, and has improved injection rate, has strengthened the ability to work of Injection Pump.When cam is positioned at lower dead center,, do not exceed the scope of positioning block though the roller pin center line exceeds tappet hole lower limb.Therefore the end face of roller pin can not wiped mutually with tappet hole lower limb, and the stressing conditions of the pump housing and tappet is normal, and it is little to wear and tear, and the life-span is long.Positioning block also has the positioning action that prevents the tappet rotation concurrently simultaneously.The manufacturing and the assembly technology of this structure are simple, oil leakage phenomenon can not take place, and are applicable to various in-line fuel injection pumps, especially compact especially triplex pump and five cylinder pumps of physical dimension.The shortcoming of prior art is: pump body structure commonly used, when the roller pin center line exceeded tappet hole lower limb, the roller pin end face can be wiped mutually with tappet hole lower limb.In various existing tappet orientation types, guider screw is installed, easily produce oil leakage phenomenon; The structure of installing and locating plate, at the pump housing vertically, when transverse dimension is compact especially, often be difficult to realize.
Fig. 1 is a kind of embodiment's of the utility model a partial, longitudinal cross-sectional.
Fig. 2 is the cross section and the cam profile figure of fuel injection pump housing.
In-line fuel injection pump among Fig. 1 comprises the pump housing (1), governor housing (2), positioning block (9), camshaft (4), tappet (6), pump housing rear end positioning block (3 rollers (7), roller pin (8), bearing support parts such as (5).Positioning block (9) is diameter D
2, thickness is the cylindrical body of B.The positioning block of pump housing rear end (3) is diameter D
2, thickness is B
1Cylindrical body, but milled a breach for installation shaft bearing (5).Two parallel planes are made in tappet (6) bottom, and the length overall that makes pin-and-hole is F.The pin-and-hole end flat prevents to rotate when tappet from pumping between the end face of two positioning blocks.
Diameter in Fig. 2 middle pump body (1) is to be processed with the circular hole D vertical with the tappet hole on the tappet hole wall of D1
2, circular hole D
2The distance at the cam hole center of center (positioning block center) to the pump housing be H.Cam hole in the pump housing below the tappet hole is a radius R
2Arc surface.Radius R
2Greater than cam tip circle radius R
1In the present embodiment, arc surface R
2With circular hole D
2Cut sub-fraction, but hole D
2Still greater than semicircle, so positioning block can not come off after packing into.
Present embodiment is chosen D
2=R
1-R
0+ 2mm, and choose H=R
0+ (d/2)+(D
2/ 2)-and 1mm, so when tappet pumped, the roller pin center line did not exceed the scope of positioning block, the roller pin end face can not wiped mutually with tappet hole lower limb.
Claims (2)
- A kind of internal combustion (IC) engine oil-jetting pump, it comprises:(1) having Base radius is R 0, the tip circle radius is R 1The camshaft of cam,(2) diameter that contacts with cam is the roller of d,(3) link by roller pin and roller, diameter is D 1Tappet, the pin-and-hole length overall on the tappet is F,(4) have the pump housing in cam hole and tappet hole,
- It is characterized in that:1, on each the tappet hole wall in the described pump housing diameter being arranged is D 2, the circular hole vertical, D with the tappet hole 2＞R 1-R 02, at above-mentioned D 2It is D that a diameter respectively is housed in the circular hole 2Positioning block (3 or 9),3, the thickness B of pump housing rear end positioning block (3) 1Less than last cylinder center to the distance C of ear end face M and the pin-and-hole length overall F on the tappet half poor, i.e. B 1＜C-(F/2),4, the thickness B of all the other each positioning blocks (9) poor less than the pin-and-hole length overall F on cylinder core distance A and the tappet, i.e. B＜A-F,5, the distance H at the cam hole center of positioning block center to the pump housing is less than radius of cam base-circle, roller radius and positioning block radius sum, i.e. H＜R 0+ (d/2)+(D 2/ 2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88202474 CN2031040U (en) | 1988-03-26 | 1988-03-26 | Fuel-injection pump for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88202474 CN2031040U (en) | 1988-03-26 | 1988-03-26 | Fuel-injection pump for internal combustion engines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2031040U true CN2031040U (en) | 1989-01-18 |
Family
ID=4837470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88202474 Withdrawn CN2031040U (en) | 1988-03-26 | 1988-03-26 | Fuel-injection pump for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2031040U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102272438A (en) * | 2009-01-06 | 2011-12-07 | 洋马株式会社 | Fuel injection pump |
| CN111102184A (en) * | 2018-10-29 | 2020-05-05 | 罗伯特·博世有限公司 | High-pressure pump and pump case thereof |
-
1988
- 1988-03-26 CN CN 88202474 patent/CN2031040U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102272438A (en) * | 2009-01-06 | 2011-12-07 | 洋马株式会社 | Fuel injection pump |
| CN102272438B (en) * | 2009-01-06 | 2013-06-19 | 洋马株式会社 | Fuel injection pump |
| CN111102184A (en) * | 2018-10-29 | 2020-05-05 | 罗伯特·博世有限公司 | High-pressure pump and pump case thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |