CN203978801U - A kind of injection pump cam structure that improves charge oil pressure - Google Patents
A kind of injection pump cam structure that improves charge oil pressure Download PDFInfo
- Publication number
- CN203978801U CN203978801U CN201420244081.5U CN201420244081U CN203978801U CN 203978801 U CN203978801 U CN 203978801U CN 201420244081 U CN201420244081 U CN 201420244081U CN 203978801 U CN203978801 U CN 203978801U
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- Prior art keywords
- cam
- circular arc
- injection pump
- cam body
- oil pressure
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Abstract
The utility model relates to cam.A kind of injection pump cam structure that improves charge oil pressure, comprise an injection pump cam main body, the cross section of cam body is the zhou duicheng tuxing of a sector structure, and upper half part of cam body is a semicircle, the extreme length of the cross section that half diameter of a circle is cam body; Lower half portion of cam body is provided with one first circular arc, and the first circular arc is positioned at the bottom of lower half portion, and the first circular arc and semicircle concentric, using the center of circle as the rotating center of cam body; The diameter of the first circular arc is less than half diameter of a circle, and the difference of the first circular arc and half diameter of a circle is not more than 25mm.The utility model, by controlling the poor of the first circular arc and half diameter of a circle, is controlled the lift situation of cam, thereby the injection pump stroke while controlling cam rotation is controlled supply time; In addition, by cam profile of the present utility model, when being convenient to any one cam of camshaft and rotating to top lift, other continuous oil storages in cam position place, and the length of holding time of top lift, thus realize the raising of charge oil pressure.
Description
Technical field
The utility model relates to mechanical & electrical technology field, is specifically related to cam.
Background technique
Camshaft is a strength member of Injection Pump, its quality directly affects the oil-supply speed of Injection Pump, this is because the cam profile on camshaft plays conclusive effect to the characteristics of motion of plunger, so the processing of cam profile is the crucial part of camshaft processing.
Cam on camshaft is used for promoting plunger to-and-fro motion, produces high pressure oil; In the time that camshaft is driven in rotation, the projection of cam, in extreme lower position, promotes plunger and constantly rises, and diesel oil is compressed, and in the time that pressure reaches certain numerical value, outlet valve is pressed off, and high pressure oil enters in reservoir; Cam fuel feeding after extreme higher position turns over several angle finishes, and low pressure oil is compressed into high pressure oil input reservoir by so continuous repetition.The cam profile of conventional cam shaft often adopts elongated sector structure, and this sector structure, because the lift of cam is large, tends to cause supply time long, but the low situation of charge oil pressure.
Model utility content
The purpose of this utility model is, a kind of injection pump cam structure that improves charge oil pressure is provided, and solves one or more in above technical problem.
The technical problem that the utility model solves can realize by the following technical solutions:
A kind of injection pump cam structure that improves charge oil pressure, comprise an injection pump cam main body, the cross section of described cam body is the zhou duicheng tuxing of a sector structure, it is characterized in that, upper half part of described cam body is a semicircle, the extreme length of the cross section that described half diameter of a circle is described cam body;
Lower half portion of described cam body is provided with one first circular arc, and described the first circular arc is positioned at the bottom of described lower half portion, described the first circular arc and described semicircle concentric, the rotating center using the described center of circle as described cam body;
The diameter of described the first circular arc is less than described half diameter of a circle, and the difference of described the first circular arc and described half diameter of a circle is not more than 25mm.
The utility model, by controlling the poor of the first circular arc and described half diameter of a circle, is controlled the lift situation of cam, thereby the injection pump stroke while controlling cam rotation is controlled supply time; In addition, by cam profile of the present utility model, when being convenient to any one cam of camshaft and rotating to top lift, other continuous oil storages in cam position place, and the length of holding time of top lift, thus realize the raising of charge oil pressure.
Lower half portion of described cam body be provided with one with the tangent tangent line of described the first circular arc, the left and right sides of symmetrical and described the first circular arc of described tangent line, the angle of the center line of described tangent line and described cam body is not less than 60 °, is not more than 70 °.
The extreme length of the cross section of described cam body is 56mm～60mm, the Extreme breadth 44mm～48mm of the cross section of described cam body.
Between described tangent line and described semicircle, be provided with a transition arc, the radius of described transition arc is not less than 1mm, is not more than 10mm.Flatness while improving cam rotation.
The thickness of described cam body is not less than 18mm.By controlling the thickness of cam body, thereby improve the bearing strength of cam, improve the fatigue resistance of cam.
Described cam body is provided with an axis hole, and described rotating center is positioned on the center line of described axis hole.Be convenient to removably connecting of cam body.
The aperture of described axis hole is less than 2 times of radiuses of described the first circular arc, is greater than the radius of described the first circular arc.The size of controlling axis hole contributes to improve after cam body installation and main shaft, the stability of rotation.
Described cam body is provided with a protective layer outward.Thereby improve impact resistance of the present utility model, improve noise damping, there is good erasure effect; Protective layer can reduce wearing and tearing, and the mechanical spark producing while reducing wear reduces the probability of happening exploding, and extends the working life of cam.
Described protective layer is positioned on the external diameter of described cam body.Compare and be coated on whole cam body, the more effective cost of having saved.
In described protective layer, be provided with a cooling medium layer, described cooling medium layer is wrapped between described protective layer and described cam body outer wall.Thereby the mechanical spark probability causing while reducing cam rotation by described cooling medium.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the utility model cam body cross section.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with further elaboration the utility model of concrete diagram.
With reference to Fig. 1, improve an injection pump cam structure for charge oil pressure, comprise an injection pump cam main body 1, the cross section of cam body 1 is the zhou duicheng tuxing of a sector structure, upper half part of cam body 1 is a semicircle, and half diameter of a circle is the extreme length of the cross section of cam body 1; Lower half portion of cam body 1 is provided with one first circular arc, and the first circular arc is positioned at the bottom of lower half portion, and the first circular arc and semicircle concentric, using the center of circle as the rotating center of cam body 1; The diameter of the first circular arc is less than half diameter of a circle, and the difference of the first circular arc and half diameter of a circle is not more than 25mm.The utility model, by controlling the poor of the first circular arc and half diameter of a circle, is controlled the lift situation of cam, thereby the injection pump stroke while controlling cam rotation is controlled supply time; In addition, by cam profile of the present utility model, when being convenient to any one cam of camshaft and rotating to top lift, other continuous oil storages in cam position place, and the length of holding time of top lift, thus realize the raising of charge oil pressure.
Between semicircle and the first circular arc, be provided with a connecting line, on connecting line and vertical direction, angle is not less than 60 °.Connecting line is positioned at lower half portion of cam body, and connecting line is one and the tangent tangent line of the first circular arc, the symmetrical left and right sides with the first circular arc of tangent line, and the angle of the center line of tangent line and cam body 1 is not less than 60 °, is not more than 70 °.Between tangent line and semicircle, be provided with a transition arc, the radius of transition arc is not less than 1mm, is not more than 10mm.Flatness while improving cam rotation.
The extreme length of the cross section of cam body 1 is 56mm～60mm, the Extreme breadth 44mm～48mm of the cross section of cam body 1.The thickness of cam body 1 is not less than 18mm.By controlling the thickness of cam body 1, thereby improve the bearing strength of cam, improve the fatigue resistance of cam.
Cam body 1 is provided with an axis hole, and rotating center is positioned on the center line of axis hole.Be convenient to the axle that removably connects of cam body 1.Axis hole inside is provided with an installation plug-in unit.It can be a buckle structure that plug-in unit is installed.The aperture of axis hole is less than 2 times of radiuses of the first circular arc, is greater than the radius of the first circular arc.The size of controlling axis hole contributes to improve after cam body 1 installation and main shaft, the stability of rotation.
Cam body is provided with a protective layer outward.Thereby improve impact resistance of the present utility model, improve noise damping, there is good erasure effect; Protective layer can reduce wearing and tearing, and the mechanical spark producing while reducing wear reduces the probability of happening exploding, and extends the working life of cam.
Between cam body and protective layer, be provided with an adhesive layer, protective layer is a wear-resisting pressure-resistant rubber layer.Thereby realize wear-resisting withstand voltage, reduce wearing and tearing effect.Protective layer can be also a coat of metal, is provided with a cooling medium layer in protective layer, and cooling medium layer is wrapped between protective layer and cam body outer wall.Thereby the mechanical spark probability causing while reducing cam rotation by cooling medium.Protective layer is positioned on the external diameter of cam body.Compare and be coated on whole cam body, the more effective cost of having saved.In cooling medium layer, be provided with a refrigeration system, control in real time the temperature of cam outer wall by refrigeration system.
More than show and described basic principle of the present utility model and major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (10)
1. one kind is improved the injection pump cam structure of charge oil pressure, comprise an injection pump cam main body, the cross section of described cam body is the zhou duicheng tuxing of a sector structure, it is characterized in that, upper half part of described cam body is a semicircle, the extreme length of the cross section that described half diameter of a circle is described cam body;
Lower half portion of described cam body is provided with one first circular arc, and described the first circular arc is positioned at the bottom of described lower half portion, described the first circular arc and described semicircle concentric, the rotating center using the described center of circle as described cam body;
The diameter of described the first circular arc is less than described half diameter of a circle, and the difference of described the first circular arc and described half diameter of a circle is not more than 25mm.
2. a kind of injection pump cam structure that improves charge oil pressure according to claim 1, it is characterized in that: lower half portion of described cam body is provided with a tangent line tangent with described the first circular arc, the left and right sides of symmetrical and described the first circular arc of described tangent line, the angle of the center line of described tangent line and described cam body is not less than 60 °, is not more than 70 °.
3. a kind of injection pump cam structure that improves charge oil pressure according to claim 1, is characterized in that: the extreme length of the cross section of described cam body is 56 mm～60mm the Extreme breadth 44mm～48mm of the cross section of described cam body.
4. a kind of injection pump cam structure that improves charge oil pressure according to claim 2, is characterized in that: between described tangent line and described semicircle, be provided with a transition arc, the radius of described transition arc is not less than 1mm, is not more than 10mm.
5. a kind of injection pump cam structure that improves charge oil pressure according to claim 1, is characterized in that: the thickness of described cam body is not less than 18mm.
6. a kind of injection pump cam structure that improves charge oil pressure according to claim 1, is characterized in that: described cam body is provided with an axis hole, and described rotating center is positioned on the center line of described axis hole.
7. a kind of injection pump cam structure that improves charge oil pressure according to claim 6, is characterized in that: the aperture of described axis hole is less than 2 times of radiuses of described the first circular arc, is greater than the radius of described the first circular arc.
8. a kind of injection pump cam structure that improves charge oil pressure according to claim 1, is characterized in that: described cam body is provided with a protective layer outward.
9. a kind of injection pump cam structure that improves charge oil pressure according to claim 8, is characterized in that: described protective layer is positioned on the external diameter of described cam body.
10. a kind of injection pump cam structure that improves charge oil pressure according to claim 8, is characterized in that: in described protective layer, be provided with a cooling medium layer, described cooling medium layer is wrapped between described protective layer and described cam body outer wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420244081.5U CN203978801U (en) | 2014-05-13 | 2014-05-13 | A kind of injection pump cam structure that improves charge oil pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420244081.5U CN203978801U (en) | 2014-05-13 | 2014-05-13 | A kind of injection pump cam structure that improves charge oil pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203978801U true CN203978801U (en) | 2014-12-03 |
Family
ID=51976253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420244081.5U Expired - Fee Related CN203978801U (en) | 2014-05-13 | 2014-05-13 | A kind of injection pump cam structure that improves charge oil pressure |
Country Status (1)
| Country | Link |
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| CN (1) | CN203978801U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352044A (en) * | 2016-07-25 | 2017-01-25 | 马勒技术投资(中国）有限公司 | Cam piece with anti-abrasion coating |
-
2014
- 2014-05-13 CN CN201420244081.5U patent/CN203978801U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352044A (en) * | 2016-07-25 | 2017-01-25 | 马勒技术投资(中国）有限公司 | Cam piece with anti-abrasion coating |
| CN106352044B (en) * | 2016-07-25 | 2019-10-25 | 马勒技术投资(中国）有限公司 | Cam bit equipped with wear-resistant coating |
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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: 20141203 Termination date: 20190513 |