CN218177872U - Component assembly and internal combustion engine comprising a component assembly - Google Patents
Component assembly and internal combustion engine comprising a component assembly Download PDFInfo
- Publication number
- CN218177872U CN218177872U CN202123172543.6U CN202123172543U CN218177872U CN 218177872 U CN218177872 U CN 218177872U CN 202123172543 U CN202123172543 U CN 202123172543U CN 218177872 U CN218177872 U CN 218177872U
- Authority
- CN
- China
- Prior art keywords
- component assembly
- crankshaft
- connection
- belt pulley
- toothed
- 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.)
- Active
Links
Images
Landscapes
- Pulleys (AREA)
Abstract
The utility model relates to a component assembly and an internal-combustion engine including component assembly, wherein, component assembly designs to be in crankshaft (21) of component assembly with axle-hub connection (20) between toothed belt pulley (22) of component assembly, wherein, axle-hub connection passes through the crankshaft with toothed belt pulley's force fit's connection forms, wherein, toothed belt pulley is made by sintered steel, wherein, toothed belt pulley forms through pressing steel powder into the pressing type body and then sintering in the mould the pressing type body, wherein, on toothed belt pulley's axle-hub connection's axial contact surface (34), form surface structure with the help of laser, wherein, surface structure is constructed with the material uplift of the point hair style of being made by the structure of martensite.
Description
Technical Field
The present invention relates to a component assembly and an internal combustion engine having a component assembly, wherein the component assembly is designed as a shaft-hub connection between a crankshaft of the component assembly and a toothed belt pulley of the component assembly, wherein the shaft-hub connection is formed by a force-fitting connection of the crankshaft with the toothed belt pulley, wherein the toothed belt pulley is composed of sintered steel, wherein the toothed belt pulley is formed by pressing steel powder in a mold into a pressed form and then sintering the pressed form.
Background
Force-fitting or friction-fitting shaft-hub connections are sufficiently known from the prior art and always comprise a crankshaft and a hub or wheel, which is connected fixedly to the crankshaft directly or sometimes by means of further components. The other component can be, for example, a bushing which is connected in a force-fitting manner to the crankshaft or the toothed belt pulley or connects them together.
A force-fitting connection can be formed by clamping the components using expansion screws. The shaft-hub connection can be formed here by a screw connection or by crimping. A pressure force is then generated at the connection points of the components or at the corresponding contact surfaces of the components, by means of which a torque can be transmitted in a force-fitting manner. The torque transmission is dependent here primarily on the surface pressure and the friction between the components thus engaged. In order to achieve sufficient torsional strength, the respective contact surfaces are therefore configured with a defined roughness.
It is also known to design toothed pulleys for producing a force-fitting connection between a crankshaft and the toothed pulley as a sintered component made of sintered steel. In the production of sintered components, steel powder is pressed into a mold, and a binder is sometimes added, so that a dimensionally stable pressed body is formed. The pressed body is subsequently sintered, whereby a sintered component is formed. Such sintered components can be easily and inexpensively manufactured in large quantities. A disadvantage of the known component assembly or of the shaft-hub connection to the sintered component is that the force-fit or friction-fit connection for transmitting high torques can only be designed to a limited extent with the sintered component. The sintered component may then have a lower load-bearing capacity due to its structure or its grain structure, so that the surface pressure and thus the torsional strength of the respective contact surfaces is limited. Even by adjusting or increasing the roughness of the contact surfaces of the sintered components, this disadvantage cannot be compensated satisfactorily.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is therefore to provide a component assembly which makes it possible in a simple manner to improve the torsional strength of the crankshaft of the component assembly and of the toothed belt pulley of the component assembly.
This object is achieved by a component assembly and an internal combustion engine comprising the component assembly. The component assembly is designed as a shaft-hub connection between a crankshaft of the component assembly and a toothed belt pulley of the component assembly, wherein the shaft-hub connection is formed by a force-fitting connection of the crankshaft to the toothed belt pulley, wherein the toothed belt pulley is made of sintered steel, wherein the toothed belt pulley is formed by pressing steel powder in a die to a pressed form and then sintering the pressed form, characterized in that a surface structure is formed by means of a laser on an axial contact surface of the shaft-hub connection of the toothed belt pulley, wherein the surface structure is formed with a pointed material elevation made of a martensitic structure.
The component assembly according to the invention is designed as a shaft-hub connection between a crankshaft of the component assembly and a toothed belt pulley of the component assembly, wherein the shaft-hub connection is formed by a force-fitting connection of the crankshaft with the toothed belt pulley, wherein the toothed belt pulley is made of sintered steel, wherein the toothed belt pulley is formed by pressing steel powder into a press-formed body in a die and then sintering the press-formed body, wherein a surface structure is formed by means of laser on an axial contact surface of the shaft-hub connection of the toothed belt pulley, wherein the surface structure is configured with a material elevation of the pointed head type made of martensitic structure.
The toothed belt pulley is therefore used to form a force-fitting connection of the crankshaft. Toothed pulleys have been formed by simply pressing steel powder into a compact in a die and then sintering the compact. Toothed pulleys for forming the shaft-hub connection can therefore be produced inexpensively in large numbers. Before the formation of the shaft-hub connection, according to the invention, the toothed belt wheel is machined by means of laser on the subsequently formed axial contact surface of the compression connection. Here, a laser is used which is adapted to modify the axial contact surface at least to a certain extent so as to form the surface structure by locally melting and evaporating the material of the toothed belt pulley. During the machining of the contact surface by means of a laser, sharp material elevations are produced, wherein these material elevations are formed predominantly from the martensitic structure. In the entire structure up to a depth of 0.01mm below the surface, the proportion of the martensite structure may be at least 80% or more. Due to the laser energy partially applied to the axial contact surface, the material elevations formed by melting or discarding the material along the initial level of the toothed pulley surface are briefly heated, wherein the ferritic structure of the sintered steel is at least partially, preferably completely, transformed into a martensitic structure, and the material elevations likewise cool rapidly. During the heating of the ferritic structure, an austenitic structure is formed, which is subsequently transformed into a martensitic structure. It is thus possible to form a material ridge with a particularly high hardness on the axial contact surface of the toothed pulley, substantially independently of the hardness of the rest of the sintered component. These material elevations can therefore also be pressed particularly well into the axial mating contact surface of the crankshaft of the other component or of the shaft-hub connection part, so that by means of this comparatively simple surface treatment a high coefficient of friction can be produced, which in turn leads to a particularly torque-proof, force-fitting connection of the crankshaft to the toothed belt pulley.
The crankshaft may form a journal and the toothed pulley may form a journal bore, wherein the toothed pulley may be slipped onto the journal, wherein the axial contact surface may bear against an axial mating contact surface of the crankshaft. Journals have been formed by a stepped diameter or collar at one end of the crankshaft, wherein the outer diameter of the journal may be substantially equal to the inner diameter formed in the toothed pulley. A clearance fit, transition fit, or press fit may be formed between the toothed pulley and the crankshaft or journal. The pin journal allows a positionally precise arrangement of the toothed belt pulley on the crankshaft and a correspondingly precise relative arrangement of the axial contact surfaces on the axial mating contact surfaces.
The axial contact surface can be designed substantially annularly in the journal bore. The axial mating contact surface can thus surround the shaft journal in a circular ring shape. The axial contact surface can also be designed partially modified, for example by flattening or the like.
The force-fitting connection of the shaft-hub connection can be formed by a threaded connection. By means of the threaded connection, a pressing force can be generated particularly simply between the axial contact surface and the axial mating contact surface.
The threaded connection may be formed by a screw which engages into an internal thread formed coaxially in the crankshaft. The internal thread can be easily formed at the end of the crankshaft, so that, in order to fix the toothed pulley to the crankshaft, it is only necessary to screw a screw into the internal thread. The screw may be an expansion screw and a washer may be provided for support under the screw head.
The threaded connection may be formed by a nut which engages into an external thread formed coaxially on the crankshaft. An external thread, which may also be a fine thread, may be formed on one end or journal of the crankshaft. After the toothed pulley has been positioned on the journal or threaded journal, the toothed pulley can be clamped to the crankshaft by means of a nut. Here, a washer may also be provided for support under the nut.
Furthermore, the material ridge may be formed and hardened by a laser. This forming and hardening can be carried out in one working step for forming the surface structure with a laser.
The toothed pulley can be designed to have a hardness of 80 to 250HB, preferably 100 to 200 HB. The hardness indicated here in accordance with EN ISO 6506-1 to EN ISO 6506-4 is understood to be the hardness of toothed pulleys, with the exception of the material ridges. The toothed belt pulley can therefore be designed to be relatively soft and tough or not too hard, whereby the breaking strength of the shaft-hub connection can be increased. The material ridges can be designed to be harder than the basic structure of the toothed pulley. Even so, the pointed material bulge can still be pressed into the axial contact surface of the crankshaft.
The material elevations made of the martensitic structure can be designed to have a hardness of ≥ 600HV 0.01, preferably ≥ 700HV 0.01. Hardness measured with a test force of 0.01kp according to DIN EN ISO 6507-1, 2005 to-4, is herein understood to be the hardness measured only on the ridges of the material. The hardness of the material ridge can thus be significantly greater than the hardness of the rest of the toothed belt wheel, which facilitates the entry of the material ridge into the opposite axial contact surface.
The axial contact surface can be designed to have a roughness or mean roughness depth of RZ 5 μm to 100 μm, preferably 20 μm to 50 μm. Such roughness can be easily formed with a laser, which for example machines the axial contact surfaces in a continuous sequence of movements. The laser may also form a machining pattern as a surface structure on the axial contact surface. The roughness achieved in each of these machining regions then advantageously increases the coefficient of friction of the axial contact surfaces.
The toothed belt pulley can be designed to have a carbon content of 0.3 to 1.5% by weight, preferably 0.4 to 0.9% by weight. The toothed pulley can have such a carbon content at least in the region of the axial contact surface. Preferably, the entire toothed pulley has the above-described carbon content. This ensures that the material bulge can be hardened.
The toothed belt pulley can also be designed to have a copper content of 1 to 2% by weight. The manufacture of toothed pulleys can be facilitated by the addition of copper in powder form.
After the first sintering, the toothed belt pulley can be pressed again in the mold and then sintered again. Overall, this makes it possible to achieve a higher compression of the material of the toothed belt pulley.
Furthermore, the toothed pulley may be steam treated prior to forming the surface structure.
The toothed pulley can also preferably be calibrated in the mold. Toothed pulleys can thus be produced with particularly precise dimensions.
However, it is also possible to form the surface structure immediately after sintering. Possible further work steps after sintering can therefore be dispensed with in order to form the surface structure, as a result of which the method can be carried out particularly cost-effectively.
The crankshaft may be a crankshaft of an internal combustion engine, wherein the toothed belt pulley may also be a gear, a sprocket or a belt pulley, wherein the force-fit connection of the shaft-hub connection may be formed by a threaded connection or as an end-face press connection.
The internal combustion engine according to the invention has a component assembly according to the invention or has a shaft-hub connection with a toothed belt pulley and a crankshaft.
Drawings
The invention is explained in more detail below with reference to the drawings.
FIG. 1 shows a photomicrograph of a toothed pulley transverse to the contact surface;
FIG. 2 is an enlarged view of the surface structure of the contact surface of the toothed pulley;
FIG. 3 is an enlarged surface configuration of the mating contact surface of the crankshaft;
figure 4 shows a cross-sectional view of the shaft-hub connection.
Detailed Description
Fig. 1 shows a photomicrograph, only partially shown here, of a toothed pulley 10 having a structure 11 and an axial contact surface 12. By means of a laser, not shown here, a surface structure 13 is formed on the axial contact surface 12, which surface structure has material elevations 14 and depressions 15 between these material elevations. The material elevation 14 is in particular constructed with a martensitic structure 16.
Fig. 2 shows an axial contact surface 17 of a toothed belt pulley (not shown here) with a surface structure 18 which is designed with a material elevation in the form of a tip, not shown here in detail. The axial contact surface 17 is structured by means of a laser such that the material elevations have a martensitic structure. The axial contact surface 17 is in contact with an axial mating contact surface 19 shown in fig. 3 to form a shaft-hub connection, wherein, when the shaft-hub connection is loosened, grooves or roughness structures 20 are formed in the axial mating contact surface 19 due to the hard, pointed material elevations of the axial contact surface 17.
Fig. 4 shows a cross-section of the shaft-hub connection 20 formed by the crankshaft 21 and the toothed belt pulley 22. The toothed pulley 22 is formed of sintered steel by pressing a steel powder into a compact in a die and then sintering the compact. At one end 23 of the crankshaft 21, a journal 24 having a collar 25 is formed. Furthermore, an internal thread 26 is formed at the end 23, into which a screw 27 of the shaft-hub connection 20 is screwed. Toothed pulley 22 is designed with journal hole 28 and continuous hole 29. The diameter 30 of the journal 24 is here substantially equal to the diameter 31 of the bore 29. The diameter 32 of the collar 25 is here substantially equal to the diameter 33 of the journal bore 28. In the journal bore 28, the axial contact surface 34 is machined by means of a laser, so that a surface structure, not shown here, is formed in the manner illustrated in fig. 1 and 2, wherein the surface structure is formed with a pointed material elevation made of a martensitic structure. The axial contact surface 34 bears against an axial mating contact surface 35 of the crankshaft 21, which is formed on the collar 25. The axial contact surface 34 is pressed by the screw 27 against an axial mating contact surface 35, so that a non-positive connection is formed between the crankshaft 21 and the toothed belt pulley 22. The pointed material elevations are in this case pressed in particular into the axial mating contact surfaces 35, so that with a relatively simple surface structure a high coefficient of friction is produced, which in turn produces a particularly rotationally fixed connection of the crankshaft 21 to the toothed belt pulley 22.
Claims (8)
1. Component assembly, wherein the component assembly is designed as a shaft-hub connection (20) between a crankshaft (21) of the component assembly and a toothed pulley (10, 22) of the component assembly, wherein the shaft-hub connection is formed by a force-fitting connection of the crankshaft to the toothed pulley, wherein the toothed pulley is made of sintered steel, wherein the toothed pulley is formed by pressing steel powder in a die to a pressed form and then sintering the pressed form,
it is characterized in that the preparation method is characterized in that,
on the axial contact surface (12, 17, 34) of the shaft-hub connection of the toothed pulley, a surface structure (13, 18) is formed by means of a laser, wherein the surface structure is formed with a pointed material elevation (14) made of a martensitic structure (16).
2. The component assembly as set forth in claim 1,
it is characterized in that the preparation method is characterized in that,
the crankshaft (21) forming journals (24) and collars (25), and the toothed pulleys (10, 22) forming journal bores (28) and continuous bores (29), wherein the toothed pulleys are slipped onto the crankshaft with the diameter of the journals (24) being equal to the diameter of the continuous bores (29) and the diameters of the collars (25) being equal to the diameter of the journal bores (28),
wherein the axial contact surfaces (12, 17, 34) bear against axial mating contact surfaces (19, 35) of the crankshaft.
3. The component assembly as set forth in claim 2,
it is characterized in that the preparation method is characterized in that,
the axial contact surfaces (12, 17, 34) are designed substantially in the form of a ring in the journal bore (28).
4. The component assembly of claim 2 or 3,
it is characterized in that the preparation method is characterized in that,
the non-positive connection of the shaft-hub connection (20) is formed by a screw connection.
5. The component assembly as set forth in claim 4,
it is characterized in that the preparation method is characterized in that,
the threaded connection is formed by a screw (27) which engages into an internal thread (26) formed coaxially in the crankshaft (21).
6. The component assembly as set forth in claim 4,
it is characterized in that the preparation method is characterized in that,
the threaded connection is formed by a nut which engages into an external thread formed coaxially on the crankshaft (21).
7. The component assembly as set forth in claim 1,
it is characterized in that the preparation method is characterized in that,
the axial contact surfaces (12, 17, 34) are designed to have a roughness of 20 [ mu ] m to 50 [ mu ] m.
8. An internal combustion engine comprising the component assembly of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123172543.6U CN218177872U (en) | 2021-12-16 | 2021-12-16 | Component assembly and internal combustion engine comprising a component assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123172543.6U CN218177872U (en) | 2021-12-16 | 2021-12-16 | Component assembly and internal combustion engine comprising a component assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218177872U true CN218177872U (en) | 2022-12-30 |
Family
ID=84605747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123172543.6U Active CN218177872U (en) | 2021-12-16 | 2021-12-16 | Component assembly and internal combustion engine comprising a component assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218177872U (en) |
-
2021
- 2021-12-16 CN CN202123172543.6U patent/CN218177872U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101320178B1 (en) | Assembled camshaft | |
| CA1294798C (en) | Assembled cam shaft and method of manufacturing same | |
| JP3309344B2 (en) | Manufacturing method of gear with center hole | |
| US6013225A (en) | Surface densification of machine components made by powder metallurgy | |
| JP2012509446A (en) | Gear and balance shaft for piston engine | |
| CN106837453B (en) | A kind of Combined hollow camshaft and its processing technology | |
| JPH0683862B2 (en) | Hollow camshaft manufacturing method | |
| CA2554662A1 (en) | Ring gear and manufacturing method for such a ring gear | |
| JP2007262536A (en) | Sintered gear and its production method | |
| AU2007276084A1 (en) | A die assembly and a method of making it | |
| US4399681A (en) | Forging of an article having a plurality of longitudinally arranged protuberances | |
| CN218177872U (en) | Component assembly and internal combustion engine comprising a component assembly | |
| JP2016500143A (en) | Assembly crankshaft and method of manufacturing assembly crankshaft | |
| KR20010085179A (en) | Method of manufacturing a ti alloy poppet valve | |
| US6821362B2 (en) | Manufacturing method of auger | |
| DE102007015958B4 (en) | Force and / or frictional connection | |
| KR101197064B1 (en) | Method of manufacturing component member in vgs type turbo charger, component member manufactured by the method, exhaust guide assembly of vgs type turbo charger using the component member, and vgs type turbo charger incorporating the exhaust guide assembly | |
| WO2013011064A1 (en) | Camshaft and corresponding production method | |
| US20060199652A1 (en) | Connection of two structural parts | |
| CN111468733B (en) | Preparation method of powder metallurgy shaft sleeve for automobile VVT cover plate | |
| WO2019002142A1 (en) | Forging method, rotor shaft and electric motor | |
| WO2009136515A1 (en) | Metal component manufacturing method using plastic flow bonding | |
| US6688148B1 (en) | Manufacturing process for making engine components of high carbon content steel using cold forming techniques | |
| KR960000659B1 (en) | Method of connecting metal ring gear to metal boss | |
| US8303891B2 (en) | Method for producing non-circular toothed belt pulleys or sprockets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |