CN215949609U - Diesel engine powder metallurgy camshaft structure - Google Patents
Diesel engine powder metallurgy camshaft structure Download PDFInfo
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- CN215949609U CN215949609U CN202122167343.5U CN202122167343U CN215949609U CN 215949609 U CN215949609 U CN 215949609U CN 202122167343 U CN202122167343 U CN 202122167343U CN 215949609 U CN215949609 U CN 215949609U
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Abstract
The utility model discloses a powder metallurgy camshaft structure of a diesel engine, which comprises a camshaft body, and further comprises an exhaust cam and an intake cam which are sleeved in the middle of the camshaft body and are arranged at intervals, wherein an oil pump cam is sleeved between the exhaust cam and the intake cam on the camshaft body; the timing gear is obtained at one end of a camshaft shaft body through injection molding, a connecting cylinder is obtained at the edge position of the inner side of an inner end face of the timing gear through injection molding and integrated molding, the connecting cylinder extends towards the other end of the camshaft shaft body and is respectively connected and fixed with an exhaust cam, an intake cam and an oil pump cam into a whole, and a positioning circular plate is obtained at the far end of the connecting cylinder through integrated molding; and the exhaust cam, the intake cam and the oil pump cam are each formed with projections on their outer circumferential surfaces by powder metallurgy. The utility model has the advantages of better ensuring the precision, more convenient processing and manufacturing, ensuring the structural strength and saving materials.
Description
Technical Field
The utility model relates to the technical field of camshafts, in particular to a powder metallurgy camshaft structure of a diesel engine.
Background
The camshaft is a component in a piston engine. Its function is to control the opening and closing action of the valve. Because valve motion laws are related to the power and operating characteristics of an engine, camshaft design and manufacture have a significant position in engines.
At present, most of conventional camshafts are steel parts. Usually by forging followed by machining and heat treatment. The existing processing mode causes low production efficiency. And camshaft and timing gear all adopt separately to process the keyway, then carry out the pressure equipment with the keyway locate mode, this makes the distribution of camshaft regularly have the influence, and the error is great. The cam is also subjected to heat treatment to improve the hardness, and the influence on the environment is large. In the machining process, because of the problems of the precision of equipment and the machining efficiency, the cams are respectively machined and then assembled on the cam shaft, so that the molded line, the roughness and the gas distribution phase of the cams cannot meet the design and use requirements, and the emission, the fuel economy efficiency and the service life of the diesel engine are influenced. And the existing camshaft structure is unreasonable in design, so that the heat treatment of the timing gear is easy to deform to influence the transmission precision.
Therefore, how to provide a diesel engine powder metallurgy camshaft structure which can better guarantee accuracy, can be more convenient to process and manufacture, can save materials while guaranteeing structural strength becomes the technical problem to be solved by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is how to provide a diesel engine powder metallurgy camshaft structure which can better ensure the precision, can be more conveniently processed and manufactured, and can save materials while ensuring the structural strength.
In order to achieve the purpose, the utility model provides a powder metallurgy camshaft structure of a diesel engine, which comprises a camshaft body, an exhaust cam and an intake cam, wherein the exhaust cam and the intake cam are sleeved in the middle of the camshaft body and are arranged at intervals; the timing gear is obtained at one end of a camshaft shaft body through injection molding, a connecting cylinder is obtained at the edge position of the inner side of an inner end face of the timing gear through injection molding and integral molding, the connecting cylinder extends towards the other end of the camshaft shaft body and is respectively connected and fixed with an exhaust cam, an intake cam and an oil pump cam into a whole, and a positioning circular plate is obtained at the far end of the connecting cylinder through integral molding; and the exhaust cam, the intake cam and the oil pump cam are each formed with projections on their outer circumferential surfaces by powder metallurgy.
In this way, in the above-described camshaft structure, the functional components, the timing gear, the positioning circular plate, the exhaust cam, the intake cam, and the oil pump cam, are provided on the camshaft shaft body, and the unique positional relationship and the mutual positional relationship among the exhaust cam, the intake cam, and the oil pump cam make it difficult to satisfy the positional accuracy between the respective components by adopting respective machining and reassembly after forging. In this structure, establish the camshaft axis body through with exhaust cam, air intake cam and oil pump cam cover to adjust the mutual position between exhaust cam, air intake cam and the oil pump cam, the nylon of rethread moulding plastics obtains the timing gear at camshaft axis body one end shaping, makes the inboard border position of terminal surface in the timing gear to mould plastics integrated into one piece through the nylon and obtains the connecting cylinder simultaneously. So that the connecting cylinder extends towards the other end of the camshaft shaft body and is respectively connected and fixed with the exhaust cam, the intake cam and the oil pump cam. And finally, respectively forming the outer circumferential surfaces of the exhaust cam, the intake cam and the oil pump cam by powder metallurgy to obtain the convex parts. In the structure, the mold can be used for supporting and positioning the camshaft shaft body, the exhaust cam, the intake cam and the oil pump cam, then the connecting cylinder and the cavity corresponding to the timing gear in the mold are injected and filled so as to complete the connection and positioning between the components, and finally the integrally formed protruding part is processed through powder metallurgy. (the corresponding die is the existing die structure), the camshaft structure has the advantages of better ensuring precision and more convenient processing and manufacturing; and the bulge is obtained by adopting powder metallurgy processing, and pores are formed in the bulge, so that lubricating oil can be stored better, and the wear-resisting property is better.
Preferably, the convex part comprises a first convex part and a second convex part which are formed by extending and partially protruding the outer circumferential surfaces of the exhaust cam and the intake cam; and the included angle between the whole first protruding part and the whole second protruding part is set to be 90 degrees.
Like this, the contained angle between first bulge is whole and the second bulge is 90 degrees angles and sets up, satisfying operation requirement that can be better.
Preferably, the protruding parts include a third protruding part and a fourth protruding part which are formed by extending and protruding the outer circumferential surface of two sides of the oil pump cam partially.
Like this, oil pump cam's structural design is more reasonable, can be better satisfy operation requirement.
Preferably, the outer end face of the timing gear is provided with a circle of annular weight reduction grooves.
Therefore, the annular weight-reducing groove is formed in the outer end face of the timing gear, so that on one hand, the weight-reducing effect can be achieved, and the consumed power is smaller; on the other hand, the camshaft is obtained by adopting powder metallurgy processing, and materials are saved while the strength of the timing gear is not reduced.
Preferably, the two side walls of the weight-reducing groove are respectively arranged in an inclined manner, and the open end of the weight-reducing groove is arranged in a flaring manner.
Like this, subtract the structural design of heavy recess more reasonable, can make things convenient for manufacturing more.
As optimization, the inner end face of the timing gear and the outer circumferential face of the connecting cylinder are in smooth transition through a fillet.
Therefore, the inner end face of the timing gear and the outer circumferential face of the connecting cylinder are in smooth transition through a fillet, stress concentration can be better reduced, and the service life can be better prolonged.
For optimization, the outer end face of the timing gear is also provided with a boss section with a small outer end diameter and a large inner end diameter; the boss section and the camshaft shaft body are arranged coaxially.
Therefore, the connection between the timing gear and the camshaft body is more compact and reliable.
As optimization, both ends of the camshaft shaft body are provided with chamfering structures.
Like this, through designing the chamfer structure, on the one hand can conveniently process manufacturing, on the other hand can conveniently assemble.
As optimization, the inner side surface of the positioning circular plate and the outer circumferential surface of the connecting cylinder are in smooth transition through a fillet structure.
Therefore, stress concentration between the positioning circular plate and the camshaft shaft body can be better avoided.
Preferably, the two ends of the exhaust cam, the two ends of the intake cam and the two ends of the oil pump cam are respectively provided with a rounding structure.
Thus, the structural design is more reasonable.
Drawings
Fig. 1 is a schematic structural diagram in an embodiment of the present invention.
Fig. 2 is a schematic view of the front view of fig. 1.
Fig. 3 is a schematic sectional view a-a of fig. 2.
Fig. 4 is a schematic structural view of fig. 1 rotated by an angle.
Fig. 5 is a schematic view of the structure in the right-hand direction of fig. 1.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 5, a diesel engine powder metallurgy camshaft structure comprises a camshaft body 1, and further comprises an exhaust cam 2 and an intake cam 3 which are sleeved at the middle part of the camshaft body and are arranged at intervals, wherein an oil pump cam 4 is sleeved between the exhaust cam and the intake cam on the camshaft body; a timing gear 5 is obtained at one end of a camshaft shaft body through injection molding, a connecting cylinder 6 is obtained at the edge position of the inner side of an inner end face of the timing gear through injection molding and integral molding, the connecting cylinder extends towards the other end of the camshaft shaft body and is respectively connected and fixed with an exhaust cam, an intake cam and an oil pump cam into a whole, and a positioning circular plate 7 is obtained at the far end of the connecting cylinder through integral molding; and the exhaust cam, the intake cam and the oil pump cam are each formed with projections on their outer circumferential surfaces by powder metallurgy.
In this way, in the above-described camshaft structure, the functional components, the timing gear, the positioning circular plate, the exhaust cam, the intake cam, and the oil pump cam, are provided on the camshaft shaft body, and the unique positional relationship and the mutual positional relationship among the exhaust cam, the intake cam, and the oil pump cam make it difficult to satisfy the positional accuracy between the respective components by adopting respective machining and reassembly after forging. In this structure, establish the camshaft axis body through with exhaust cam, air intake cam and oil pump cam cover to adjust the mutual position between exhaust cam, air intake cam and the oil pump cam, the nylon of rethread moulding plastics obtains the timing gear at camshaft axis body one end shaping, makes the inboard border position of terminal surface in the timing gear to mould plastics integrated into one piece through the nylon and obtains the connecting cylinder simultaneously. So that the connecting cylinder extends towards the other end of the camshaft shaft body and is respectively connected and fixed with the exhaust cam, the intake cam and the oil pump cam. And finally, respectively forming the outer circumferential surfaces of the exhaust cam, the intake cam and the oil pump cam by powder metallurgy to obtain the convex parts. In the structure, the mold can be used for supporting and positioning the camshaft shaft body, the exhaust cam, the intake cam and the oil pump cam, then the connecting cylinder and the cavity corresponding to the timing gear in the mold are injected and filled so as to complete the connection and positioning between the components, and finally the integrally formed protruding part is processed through powder metallurgy. (the corresponding die is the existing die structure), the camshaft structure has the advantages of better ensuring precision and more convenient processing and manufacturing; and the bulge is obtained by adopting powder metallurgy processing, and pores are formed in the bulge, so that lubricating oil can be stored better, and the wear-resisting property is better.
In the present embodiment, the protruding portions include a first protruding portion 8 and a second protruding portion 9 formed by extending and protruding the outer circumferential surfaces of the exhaust cam and the intake cam partially; and the included angle between the whole first protruding part and the whole second protruding part is set to be 90 degrees.
Like this, the contained angle between first bulge is whole and the second bulge is 90 degrees angles and sets up, satisfying operation requirement that can be better.
In the present embodiment, the protruding portions include a third protruding portion 10 and a fourth protruding portion 11 formed by extending and protruding outward from two outer circumferential surfaces of the oil pump cam.
Like this, oil pump cam's structural design is more reasonable, can be better satisfy operation requirement.
In the present embodiment, the outer end face of the timing gear is provided with a ring-shaped weight-reducing groove 12.
Therefore, the annular weight-reducing groove is formed in the outer end face of the timing gear, so that on one hand, the weight-reducing effect can be achieved, and the consumed power is smaller; on the other hand, the camshaft is obtained by adopting powder metallurgy processing, and materials are saved while the strength of the timing gear is not reduced.
In this embodiment, the two sidewalls of the weight-reducing groove are respectively disposed obliquely and the open end of the weight-reducing groove is disposed in a flaring manner.
Like this, subtract the structural design of heavy recess more reasonable, can make things convenient for manufacturing more.
In the specific embodiment, the inner end surface of the timing gear and the outer circumferential surface of the connecting cylinder are in smooth transition through a fillet.
Therefore, the inner end face of the timing gear and the outer circumferential face of the connecting cylinder are in smooth transition through a fillet, stress concentration can be better reduced, and the service life can be better prolonged.
In the present embodiment, the outer end surface of the timing gear is further provided with a boss section 13 with a smaller outer end diameter and a larger inner end diameter; the boss section and the camshaft shaft body are arranged coaxially.
Therefore, the connection between the timing gear and the camshaft body is more compact and reliable.
In this embodiment, both ends of the camshaft shaft body have a chamfer structure.
Like this, through designing the chamfer structure, on the one hand can conveniently process manufacturing, on the other hand can conveniently assemble.
In the embodiment, the inner side surface of the positioning circular plate and the outer circumferential surface of the connecting cylinder are in smooth transition through a fillet structure.
Therefore, stress concentration between the positioning circular plate and the camshaft shaft body can be better avoided.
In the present embodiment, the exhaust cam, the intake cam, and the oil pump cam each have a rounded structure at both ends.
Thus, the structural design is more reasonable.
The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A powder metallurgy camshaft structure of a diesel engine comprises a camshaft body, and further comprises an exhaust cam and an intake cam which are sleeved in the middle of the camshaft body and are arranged at intervals, wherein an oil pump cam is sleeved between the exhaust cam and the intake cam on the camshaft body; the timing gear is obtained at one end of a camshaft shaft body through injection molding, a connecting cylinder is obtained at the edge position of the inner side of an inner end face of the timing gear through injection molding and integrated molding, the connecting cylinder extends towards the other end of the camshaft shaft body and is respectively connected and fixed with an exhaust cam, an intake cam and an oil pump cam into a whole, and a positioning circular plate is obtained at the far end of the connecting cylinder through integrated molding; and the exhaust cam, the intake cam and the oil pump cam are each formed with projections on their outer circumferential surfaces by powder metallurgy.
2. The diesel engine powder metallurgy camshaft structure of claim 1, wherein: the convex part comprises a first convex part and a second convex part which are formed by respectively extending and protruding the outer circumferential surfaces of the exhaust cam and the intake cam; and the included angle between the whole first protruding part and the whole second protruding part is set to be 90 degrees.
3. The diesel engine powder metallurgy camshaft structure of claim 2, wherein: the convex part comprises a third convex part and a fourth convex part which are formed by respectively extending and protruding the outer circumferential surfaces of two sides of the oil pump cam.
4. The diesel engine powder metallurgy camshaft structure of claim 1, wherein: the outer end face of the timing gear is provided with a circle of annular weight reduction grooves.
5. The diesel engine powder metallurgy camshaft structure of claim 4, wherein: the two side walls of the weight-reducing groove are respectively arranged in an inclined way, and the open end of the weight-reducing groove is arranged in a flaring way.
6. The diesel engine powder metallurgy camshaft structure of claim 1, wherein: the inner end surface of the timing gear and the outer circumferential surface of the connecting cylinder are in smooth transition through a fillet.
7. The diesel engine powder metallurgy camshaft structure of claim 6, wherein: the outer end face of the timing gear is also provided with a boss section with a small outer end diameter and a large inner end diameter; the boss section and the camshaft shaft body are arranged coaxially.
8. The diesel engine powder metallurgy camshaft structure of claim 7, wherein: both ends of the camshaft shaft body are provided with chamfer angle structures.
9. The diesel engine powder metallurgy camshaft structure of claim 1, wherein: the inner side surface of the positioning circular plate and the outer circumferential surface of the connecting cylinder are in smooth transition through a fillet structure.
10. The diesel engine powder metallurgy camshaft structure of claim 1, wherein: the two ends of the exhaust cam, the intake cam and the oil pump cam are respectively provided with a rounding structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122167343.5U CN215949609U (en) | 2021-09-08 | 2021-09-08 | Diesel engine powder metallurgy camshaft structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122167343.5U CN215949609U (en) | 2021-09-08 | 2021-09-08 | Diesel engine powder metallurgy camshaft structure |
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| Publication Number | Publication Date |
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| CN215949609U true CN215949609U (en) | 2022-03-04 |
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| CN202122167343.5U Active CN215949609U (en) | 2021-09-08 | 2021-09-08 | Diesel engine powder metallurgy camshaft structure |
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- 2021-09-08 CN CN202122167343.5U patent/CN215949609U/en active Active
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