CN204877565U - Integral camshaft for natural gas engine - Google Patents
Integral camshaft for natural gas engine Download PDFInfo
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- CN204877565U CN204877565U CN201520653426.7U CN201520653426U CN204877565U CN 204877565 U CN204877565 U CN 204877565U CN 201520653426 U CN201520653426 U CN 201520653426U CN 204877565 U CN204877565 U CN 204877565U
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Abstract
The utility model belongs to the technical field of the engine, specifically relate to an integral camshaft for natural gas engine, including axle journal, inlet cam and exhaust cam, nodical inlet cam lift and the exhaust cam lift that corresponds of the valve lift curve that advances to exhaust is 0.95mm. The utility model discloses can satisfy portably reliable, high -performance advantage of heavy hauler and machineshop car operation requirement.
Description
Technical field
The utility model belongs to technical field of engines, relates to a kind of integrated natural gas engine camshaft particularly.
Background technique
The camshaft of current multi-cylinder engine is generally divided into integrated type and assembling type two kinds.One-piece camshaft be by single metal through casting or forging direct forming, then make through machining and heat treatment comprise cam, axle journal, axle all-in-one-piece camshaft.Assembled cam shaft refers to that the axle of camshaft and cam select respective material separately to manufacture according to the difference of respective position performance requirement, then by camshaft that the connecting means such as welding, sintering, Automatic manual transmission is assembled together.Though assembled cam shaft can be different and select suitable material according to camshaft each position operating mode, manufacturing process is complicated, and cost is high, and assembly technology is complicated and bring assembly error, and cam phase is difficult to control, and reject rate is high.And one-piece camshaft is relative to assembled cam shaft, good rigidly, phase control is accurate, and manufacturing process is simple, and cost is low, does not have assembly error, is widely used in the design of multi-cylinder engine.
Because natural gas engine has the combustion characteristic different from diesel engine and ignition mode, for the usage requirement of heavy hauler and engineering truck, larger difference is had in the key Design parts such as camshaft valve overlap, nose shape and bavin machine oil, on diesel engine basis, exploitation is applicable to natural gas engine, and camshaft exploitation is an important process.
Summary of the invention
The utility model is to solve the problems of the technologies described above, and provides a kind of easy to be reliable, high performance integrated natural gas engine camshaft that can meet heavy hauler and engineering truck usage requirement.
The technical solution of the utility model is: a kind of integrated natural gas engine camshaft, comprises axle journal, intake cam and exhaust cam, and the intake cam lift that described intake and exhaust valve lift curve intersection point is corresponding and exhaust cam lift are 0.95mm.
The technical solution of the utility model also comprises: described valve overlap is 25 ± 3 degree.
The technical solution of the utility model also comprises: the maximum lift of described intake cam is 10mm, and the maximum lift of exhaust cam is 12mm.
The technical solution of the utility model also comprises: the phase difference of the exhaust cam that described intake cam is adjacent is 102 ± 3 degree.
The technical solution of the utility model also comprises: described end axle journal is provided with thrust surface, and the rear end of camshaft is provided with positioning hole and bolt hole.
The technical solution of the utility model also comprises: the quantity of described axle journal is seven, and the quantity of intake cam and exhaust cam is respectively six, and intake cam and exhaust cam are from front to back by the sequential arrangement of intake cam one exhaust cam.
The beneficial effects of the utility model are: first, and by by camshaft design integrally formula, good rigidly, manufacturing process are simple, phase control is accurate; Secondly, axle is with the thrust surface that hardens coordinate with timing gear and carries out axially locating, structure is simpler, can be widely used in the exploitation of multi-cylinder engine; Again, valve overlap is designed to 25 degree, corresponding for intake and exhaust valve lift curve intersection point valve lift is designed to 0.95mm, effectively can prevent tempering, that reduces fuel sweeps sky, can ensure that natural gas engine plays peak output and Economy, to meet the usage requirement of heavy hauler and engineering truck.
Accompanying drawing explanation
Fig. 1 is the utility model camshaft and timing gear assembling schematic diagram.
Fig. 2 is the utility model camshaft ear end face schematic diagram.
In figure, 1, axle journal, 2, intake cam, 3, exhaust cam, 4, thrust surface, 5, timing gear mounting hole, 6, positioning hole, 7, bolt hole.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in detail.
A kind of integrated natural gas engine camshaft of the present utility model, usage requirement mainly for heavy hauler and engineering truck designs, and good rigidly, manufacturing process are simple, phase control accurately also can ensure that natural gas engine plays peak output and Economy.
As shown in Figure 1, rock gas camshaft of the present utility model is a kind of camshaft of six-in-line machine, has six intake cams, 2, six exhaust cams 3, enters a row be arranged in order according to one.There are seven road axle journals 1, in front end and back end and between cylinder and cylinder, for supporting to cylinder cap, and fixed by bearing cap.Support shoulders on the left of the 6th cylinder exhaust cam becomes the axial thrust face 4 for a direction of camshaft through the aft-loaded airfoil that hardens, camshaft rear end can realize the thrust in another one direction after installing timing gear, avoid and use thrust plate to carry out axially locating, features simple structure is reliable.As shown in Figure 2, there is positioning pin hole 6 camshaft rear end, for the location of pulse disc, is convenient to accurately control engine timing, and three bolts hole 7 are fixing for pulse disc and timing gear.
The phase difference of single cylinder two intake cams 2 and exhaust cam 3 is 102 ± 3 degree, and cylinder and 120 °, cylinder interval are uniformly distributed, and particularly, when phase difference is 102 degree, can farthest improves charge coefficient, can reach optimum performance.
Valve overlap is 25 ± 3 degree, and the corresponding valve lift of intake and exhaust valve lift curve intersection point is 0.95mm, and particularly, when valve overlap is 25 °, effectively can prevent tempering, that reduces fuel sweeps sky.The maximum lift of intake cam 2 is 10mm, and the maximum lift of exhaust cam 3 is 12mm, can ensure the moment of torsion needs of heavy hauler and engineering truck.
Although the foregoing describe embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present utility model and essence, can make various changes or modifications to these mode of executions, but these change and amendment all falls into protection domain of the present utility model.
Claims (6)
1. an integrated natural gas engine camshaft, comprise axle journal (1), intake cam (2) and exhaust cam (3), it is characterized in that: intake cam (2) lift that described intake and exhaust valve lift curve intersection point is corresponding and exhaust cam (3) lift are 0.95mm.
2. a kind of integrated natural gas engine camshaft as claimed in claim 1, is characterized in that: described valve overlap is 25 ± 3 degree.
3. a kind of integrated natural gas engine camshaft as claimed in claim 1 or 2, is characterized in that: the maximum lift of described intake cam (2) is 10mm, and the maximum lift of exhaust cam (3) is 12mm.
4. a kind of integrated natural gas engine camshaft as claimed in claim 3, is characterized in that: the phase difference of the exhaust cam (3) that described intake cam (2) is adjacent is 102 ± 3 degree.
5. a kind of integrated natural gas engine camshaft as claimed in claim 1, is characterized in that: described end axle journal (1) is provided with thrust surface (4), and the rear end of camshaft is provided with positioning hole (6) and bolt hole (7).
6. a kind of integrated natural gas engine camshaft as claimed in claim 1, it is characterized in that: the quantity of described axle journal (1) is seven, the quantity of intake cam (2) and exhaust cam (3) is respectively six, and intake cam (2) and exhaust cam (3) are from front to back by the sequential arrangement of an intake cam (2) exhaust cam (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520653426.7U CN204877565U (en) | 2015-08-27 | 2015-08-27 | Integral camshaft for natural gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520653426.7U CN204877565U (en) | 2015-08-27 | 2015-08-27 | Integral camshaft for natural gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204877565U true CN204877565U (en) | 2015-12-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520653426.7U Active CN204877565U (en) | 2015-08-27 | 2015-08-27 | Integral camshaft for natural gas engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204877565U (en) |
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2015
- 2015-08-27 CN CN201520653426.7U patent/CN204877565U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |