CN203009129U - Camshaft structure of gasoline direct injection engine - Google Patents
Camshaft structure of gasoline direct injection engine Download PDFInfo
- Publication number
- CN203009129U CN203009129U CN 201220604660 CN201220604660U CN203009129U CN 203009129 U CN203009129 U CN 203009129U CN 201220604660 CN201220604660 CN 201220604660 CN 201220604660 U CN201220604660 U CN 201220604660U CN 203009129 U CN203009129 U CN 203009129U
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- camshaft
- oil pump
- pressure oil
- high pressure
- cam
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- Expired - Fee Related
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Abstract
The utility model provides a camshaft structure of a gasoline direct injection engine, which comprises a camshaft made of chilled cast iron, wherein an angle detection signal panel is arranged on the camshaft, and a steel high-pressure oil pump is further arranged on the camshaft. In the camshaft structure, the high-pressure oil pump cam with a great demand for contact fatigue strength is made of steel, and the camshaft and other cams are made of relatively inexpensive chilled cast iron, but not integrally made of the same material, so that both the service performance and the economical efficiency are taken into consideration.
Description
Technical field
The utility model relates to a kind of motor drive mechanism, and more particularly, it relates to the camshaft structure on a kind of direct spray petrol engine in cylinder.
Background technique
The chilled cast iron material has that cost is low, wear resistance and resistance to marring is good, the remarkable advantage such as simple easy to process, therefore have a wide range of applications on internal combustion (IC) engine camshaft, domestic and international most of petrol engine, diesel engine all adopt chilled cast iron as camshaft and cam material at present.But along with the application of gasoline in-cylinder direct injection technology, camshaft is gone back the high pressure oil pump of demand motive direct spray petrol engine in cylinder except driving valve.Direct spray petrol engine in cylinder high pressure oil pump pressure reaches 200bar, drive on the high pressure oil pump cam of high pressure oil pump roller follower therefore and the contact stress that produces can be up to 1500Mpa, this has surpassed the contact fatigue strength limit of chilled cast iron, therefore common way is the material of integral replacing camshaft and cam, but this will increase cost of production and cause unnecessary waste of material, because camshaft does not directly bear this contact stress, the cam that only drives high pressure oil pump can bear so large contact stress.Notification number is that the model utility of CN201496187U discloses a kind of camshaft that drives high pressure oil pump on June 2nd, 2010, comprise high pressure oil pump, engine cylinder cover, camshaft is arranged on cylinder cap, protrude at cylinder cap one end and be provided with an extension part, camshaft one end extends in extension part, be provided with cam on the described camshaft that is positioned at extension part, this cam and camshaft are integrated casting and form.The utility model has the advantages that and greatly simplified high pressure oil pump, removed the parts such as gear, reduced gearing friction, saved cost.But cam and integrated camshaft casting, thereby material is identical, as select the chilled cast iron material, the contact fatigue strength of cam is limited; As select the high material of contact fatigue strength, can increase cost of production and cause waste of material.
The model utility content
Adopt same material to make in order to overcome existing direct spray petrol engine in cylinder camshaft structure camshaft and cam, thereby be difficult to take into account the defective of usability and Economy, the utility model provides a kind of can guarantee that the high pressure oil pump cam on camshaft has enough contact fatigue strengths, can control again the direct spray petrol engine in cylinder camshaft structure of whole manufacture cost.
The technical solution of the utility model is: a kind of direct spray petrol engine in cylinder camshaft structure, comprise the camshaft that the chilled cast iron material is made, and camshaft is provided with the angle detection signal dish, also is provided with the high pressure oil pump cam of steel on camshaft.The utility model convexity wheel shaft and even valve actuation cam, because the contact stress value of bearing is not high, so still available chilled cast iron manufacturing, and the high pressure oil pump cam that drives high pressure oil pump is adopted and is made of a steel, the contact stress that the steel cam can bear is 2000～2500MPa, can satisfy the requirement of high pressure oil pump cam contact fatigue strength fully, different parts use different materials according to different force environments, can satisfy like this performance requirement and can control manufacture cost again.
As preferably, be interference fit between high pressure oil pump cam and camshaft.Owing to adopting interference fit, only need between high pressure oil pump cam and camshaft note the size coupling man-hour and other fixed structure need be set adding, thereby simplify processing, the convenient installation.
As preferably, the high pressure oil pump cam is located at the end of camshaft.Corresponding the intensive valve actuation cam that arranges of a plurality of cylinders is generally wanted at the middle part of camshaft, if at the middle part of camshaft, the high pressure oil pump cam is set, high pressure oil pump also will correspondingly be arranged between cylinder, difficulty is very large, and the end of therefore the high pressure oil pump cam being located at camshaft can make high pressure oil pump more easily arrange.
As preferably, be also interference fit between angle detection signal dish and camshaft.Also adopt interference fit between angle detection signal dish and camshaft, easy for installation.
The beneficial effects of the utility model are:
Control manufacture cost when satisfying direct spray petrol engine in cylinder camshaft performance requirement.In the utility model, there is the high pressure oil pump cam of higher contact fatigue strength requirement to adopt steel making, and camshaft and other cam still adopt relatively inexpensive chilled cast iron manufacturing, rather than the whole same material of using, and have so just taken into account usability and Economy.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model.
In figure, 1-camshaft, 2-high pressure oil pump cam, 3-angle detection signal dish.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawing specific embodiment.
Embodiment:
As shown in Figure 1, a kind of direct spray petrol engine in cylinder camshaft structure, comprise the camshaft 1 that the chilled cast iron material is made, camshaft 1 is provided with high pressure oil pump cam 2 and the angle detection signal dish 3 of steel, other cam on camshaft 1 is also made with chilled cast iron, between high pressure oil pump cam 2 and camshaft 1, and be between angle detection signal dish 3 and camshaft 1 and be interference fit, high pressure oil pump cam 2 and angle detection signal dish 3 all are located at the end of camshaft 1, and wherein angle detection signal dish 3 is positioned at camshaft 1 outermost end.
each cam Execution driven valve on camshaft 1, the functions such as high pressure oil pump, when camshaft 1 rotates, each cam promotes corresponding component working, camshaft 1 rotates a week, each parts are also completed respectively the work of one-period, each cam has different phase places, their phase determination each corresponding parts be in separately certain working state on the same time, synchronous coordination work, meanwhile, angle detection signal dish 3 also is input to controller to camshaft 1 position state signal that collects, controller is according to the corresponding control signal of these input signal outputs, control relevant actuator and make corresponding actions.
Claims (4)
1. a direct spray petrol engine in cylinder camshaft structure, comprise the camshaft (1) that the chilled cast iron material is made, and camshaft (1) is provided with angle detection signal dish (3), it is characterized in that also being provided with on camshaft (1) the high pressure oil pump cam (2) of steel.
2. direct spray petrol engine in cylinder camshaft structure according to claim 1, is characterized in that being between high pressure oil pump cam (2) and camshaft (1) interference fit.
3. direct spray petrol engine in cylinder camshaft structure according to claim 1 and 2 is characterized in that high pressure oil pump cam (2) is located at the end of camshaft (1).
4. direct spray petrol engine in cylinder camshaft structure according to claim 1 and 2, is characterized in that also being between angle detection signal dish (3) and camshaft (1) interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220604660 CN203009129U (en) | 2012-11-15 | 2012-11-15 | Camshaft structure of gasoline direct injection engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220604660 CN203009129U (en) | 2012-11-15 | 2012-11-15 | Camshaft structure of gasoline direct injection engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203009129U true CN203009129U (en) | 2013-06-19 |
Family
ID=48600731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220604660 Expired - Fee Related CN203009129U (en) | 2012-11-15 | 2012-11-15 | Camshaft structure of gasoline direct injection engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203009129U (en) |
-
2012
- 2012-11-15 CN CN 201220604660 patent/CN203009129U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20130619 Termination date: 20201115 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |