WO2016030569A1 - System to reduce the fretting in a bolt-joint (especially for a crankshaft-counterweight structure) - Google Patents
System to reduce the fretting in a bolt-joint (especially for a crankshaft-counterweight structure) Download PDFInfo
- Publication number
- WO2016030569A1 WO2016030569A1 PCT/FI2014/050660 FI2014050660W WO2016030569A1 WO 2016030569 A1 WO2016030569 A1 WO 2016030569A1 FI 2014050660 W FI2014050660 W FI 2014050660W WO 2016030569 A1 WO2016030569 A1 WO 2016030569A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- counterweight
- crankshaft
- bolt
- protrusion
- bolt hole
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
- F16F15/283—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same for engine crankshafts
Definitions
- the present invention relates to a system of to each other joinable two parts, especially a crankshaft - counterweight system for piston engines. Especially the invention relates to a system of two to each other joinable two parts as defined in the preamble of independent system claim.
- Fretting refers to wear damage that is caused when two surfaces move in relation to each other with very small amplitudes.
- a typical cause of fretting is vibration under load.
- Fretting is a common problem in machines, where moving parts cause vibrations.
- a typical example of such machines is a piston engine, where movement of the pistons and pressure variations in the cylinders cause movements of the contact surfaces between various parts.
- Joints where the contact pressure is uneven are more susceptible to fretting. At the areas of low contact pressure, the contact surfaces of the joint slide more easily in relation to each other, and this causes fretting.
- Bolt joints are a typical example of joints with uneven contact pressure. The tension of a bolt causes deformation of the clamped parts around the bolt holes.
- each counterweight is typically attached to the crankshaft with two stud bolts.
- the crankshaft is provided with threaded blind holes for the stud bolts and each counterweight is provided with corresponding through holes.
- One end of each stud bolt is inserted into a hole of the crankshaft and engaged with the internal thread of the hole.
- the stud bolts are then arranged into the bolt holes of the counterweight and a nut is tightened around the second end of each stud bolt.
- bolt joints are the joints between the engine block and brackets for different parts to be joined to the engine, such as pumps, turbo chargers etc.
- Fretting damage is one problem relating to crankshafts of piston engines.
- Main reason for the fretting damage is too low contact pressure on contact surface between crankshaft and counter weights, which cannot resist the high shear stresses caused by counter weight vibrations.
- Globally contact pressure is enough to resist shear forces but contact pressure and shear stresses are not evenly distributed to whole contact surface and there are areas on the contact surface where contact pressure is very low but shear stress amplitude can be high.
- An object of the present invention is to provide a system of to each other join- able parts, in which the problems described above, in particular relating to fretting, are eliminated or at least minimized.
- One particular object of the invention is to create a crankshaft-counterweight system with an improved crankshaft - counterweight contact surface.
- One particular object of the invention is to create a part-part system with an improved contact surface.
- the system of to each other joinable two parts which parts are opposed to each other and joined to each other by at least one bolt joint comprising a bolt located through respective bolt hole such that part- part contact surface is formed, characterized in that on at least surface of one of the parts is formed at least one circular protrusion extending at least partially around the joint and that the at least one circular protrusion forms contact area of the part-part contact surface.
- each protrusion on one part is towards the opposed part and upwards from the surface of the one part.
- the protrusion is formed as two protrusions, which are located spaced apart around the bolt hole.
- the protrusion is formed as one protru- sion circumventing bolt hole.
- the contact area of the part-part contact surface formed by the protrusion/-s is defined based on the tightening force of the bolts.
- edges of the protrusion are inclined. According to an advantageous feature corners of the protrusion are rounded.
- the system is a crankshaft - counterweight system comprising a crankshaft and a counterweight, which are attached to each other by bolt joints, which comprise bolts located through bolt holes in the counterweight to threaded holes in the crankshaft so that a crankshaft - counterweight contact surface is formed, and on surface of the counterweight has been formed at least one, preferably two circular protrusion/ ⁇ , which are formed as at least two circular segments around each bolt hole of the crankshaft.
- at least one of the protrusions is located between the longitudinal end of the counterweight and the bolt hole and at least one other of the protrusions is located on opposed side of the bolt hole in respect to the other protrusion.
- crankshaft - counterweight system comprises according to an advantageous aspect a crankshaft - counterweight contact surface, wherein shape of the con- tact surface is two segments around the bolt holes of the bolt joint of the crankshaft - counterweight system, wherein the area, which is below the fillet of the main journal, is contactless, wherein the area close to the bolt holes is contactless and wherein the corners of the contact surface have rounded shape.
- Main journal fillet degreases the stiffness at the corner of the contact surface. This is a contact area where fretting damage is very likely to occur due to low contact pressure. Threads close to contact surface causes contact pressure concentration around the bolt holes.
- figure 1 is show schematically a simplified example of a crankshaft - counterweight contact surface according to prior art
- figure 2 is shown schematically a simplified example of locations of bolt holes on a crankshaft - counterweight contact surface according to an advantageous feature of the invention
- figure 3 is shown schematically a simplified example of a crankshaft - counterweight contact surface according to the invention
- figures 4A - 4C is shown schematically a simplified example of a part- part contact surface according to the invention.
- FIG 1 shows schematically a simplified example of a crankshaft - counterweight contact surface 12 (squared area) according to prior art on the coun- terweight 10 side.
- Each bolt hole 1 1 is located substantially centrally on the contact area.
- the contact area 12 is located around the corresponding bolt hole 1 1 extending to substantially whole area of the counterweight surface in cross direction and in longitudinal direction such that a square like surface is formed, when the area of the recess 13.
- Figure 2 shows schematically a simplified example of locations of bolt holes 21 on a crankshaft - counterweight contact surface 12 according to an advantageous feature. In figure 2 with dashed lines are indicated the locations of bolt holes 1 1 according to prior art. The location of the bolt hole 21 is moved slightly towards the center of the counterweight 10 in longitudinal direction and slightly away from the recess 23.
- FIG 3 shows schematically a simplified example of a crankshaft - counterweight contact surface according to the invention.
- protrusions 22A; 22B are formed as two segments around the bolt holes 21 .
- the contact pressure is more evenly distributed over the whole contact surface.
- the low contact pressure areas 31 at each end of the recess 23 are contactless and thus there is not contact in area which is below the fillet of the main journal, which were contact areas where fretting damage would very likely occur due to low contact pressure.
- the contact pressure is more evenly distributed to whole contact surface, as threads close to contact surface would cause contact pressure concentration around the bolt holes 21 .
- the protrusions 22A; 22B have rounded shape in the corners. Typically highest shear stresses due to counter weight vibrations occur in the corners of contact surfaces. With the rounded shape shear stress is more evenly distributed to whole contact area.
- each contact surface is towards the crankshaft protruding circular segment with rounded corners and inclined edges.
- FIGS 4A - 4C is schematically shown a simplified example of a part- part (10, 12) contact surface according to the invention.
- protrusions 22 are formed circularly on at least one 10 of the parts around the bolt hole 21 of the joint of the parts 10, 12.
- the contact pressure is evenly distributed over the whole contact surface.
- the protrusions 22 have rounded shape in the corners and inclined edges.
- the system has been described above by referring to a joint of a crankshaft and a counterweight, it can be used in many other applications as well such as bolt joints between the engine block and brackets for different parts to be joined to the engine, such as pumps, turbo chargers etc. Basically, the system can be applied to any two part system, where fretting phenomenon can occur.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention relates to a system of to each other join- able two parts (10, 12), which parts (10, 12) are op- posed to each other and joined to each other by at least one bolt joint comprising a bolt located through respective bolt hole such that part-part contact surface is formed. On at least surface of one (10) of the parts (10, 12) is formed at least one circular protrusion (22; 22A, 22B) extending at least partially around the joint and that the at least one circular protrusion forms con- tact area of the part-part contact surface.
Description
SYSTEM TO REDUCE THE FRETTING IN A BOLT-JOINT (ESPECIALLY FOR A CRANKSHAFT-COUNTERWEIGHT STRUCTURE)
The present invention relates to a system of to each other joinable two parts, especially a crankshaft - counterweight system for piston engines. Especially the invention relates to a system of two to each other joinable two parts as defined in the preamble of independent system claim.
Fretting refers to wear damage that is caused when two surfaces move in relation to each other with very small amplitudes. A typical cause of fretting is vibration under load. Fretting is a common problem in machines, where moving parts cause vibrations. A typical example of such machines is a piston engine, where movement of the pistons and pressure variations in the cylinders cause movements of the contact surfaces between various parts. Joints, where the contact pressure is uneven are more susceptible to fretting. At the areas of low contact pressure, the contact surfaces of the joint slide more easily in relation to each other, and this causes fretting. Bolt joints are a typical example of joints with uneven contact pressure. The tension of a bolt causes deformation of the clamped parts around the bolt holes.
An example of such a bolt joint is the joint between the crankshaft and a counterweight of a piston engine. Each counterweight is typically attached to the crankshaft with two stud bolts. The crankshaft is provided with threaded blind holes for the stud bolts and each counterweight is provided with corresponding through holes. One end of each stud bolt is inserted into a hole of the crankshaft and engaged with the internal thread of the hole. The stud bolts are then arranged into the bolt holes of the counterweight and a nut is tightened around the second end of each stud bolt.
Other examples of such bolt joints are the joints between the engine block and brackets for different parts to be joined to the engine, such as pumps, turbo chargers etc.
In publication DE3738717A1 is disclosed a built-up crankshaft, in which same screws are used to clamp the respective crank pin and the respective counterweight, the latter being provided with through holes for the screws.
In publication DE1273900B is disclosed an internal-combustion engine crankshaft having a counterweight fastened on a crank web by bolts disposed paral-
lei to the direction of centrifugal force, in which the counterweight bears against the crank web on a flat face perpendicular to the bolt axes.
In publication DE1 1 1 1877B is disclosed a device for damping of torsional and bending vibrations of the crankshaft , in which the crankshaft is resiliently fas- tened to the counterweight, wherein between the counterweight and the crankshaft a gap is provided radially and the contact surface is formed groove-or tooth-shaped and the bolts are arranged transversely to the groove.
Fretting damage is one problem relating to crankshafts of piston engines. Main reason for the fretting damage is too low contact pressure on contact surface between crankshaft and counter weights, which cannot resist the high shear stresses caused by counter weight vibrations. Globally contact pressure is enough to resist shear forces but contact pressure and shear stresses are not evenly distributed to whole contact surface and there are areas on the contact surface where contact pressure is very low but shear stress amplitude can be high.
An object of the present invention is to provide a system of to each other join- able parts, in which the problems described above, in particular relating to fretting, are eliminated or at least minimized.
One particular object of the invention is to create a crankshaft-counterweight system with an improved crankshaft - counterweight contact surface.
One particular object of the invention is to create a part-part system with an improved contact surface.
In order to achieve the above objects and those that will come apparent later the system according to the invention is characterized by the features of the characterizing part of independent system claim. Advantageous embodiments and features are defined in dependent claims.
According to the invention the system of to each other joinable two parts, which parts are opposed to each other and joined to each other by at least one bolt joint comprising a bolt located through respective bolt hole such that part- part contact surface is formed, characterized in that on at least surface of one of the parts is formed at least one circular protrusion extending at least partially
around the joint and that the at least one circular protrusion forms contact area of the part-part contact surface.
According to an advantageous feature around each bolt hole the corresponding circular protrusion is located at a distance from the edge of the bolt hole. According to an advantageous feature each protrusion on one part is towards the opposed part and upwards from the surface of the one part.
According to an advantageous feature the protrusion is formed as two protrusions, which are located spaced apart around the bolt hole.
According to an advantageous feature the protrusion is formed as one protru- sion circumventing bolt hole.
According to an advantageous feature the contact area of the part-part contact surface formed by the protrusion/-s is defined based on the tightening force of the bolts.
According to an advantageous feature edges of the protrusion are inclined. According to an advantageous feature corners of the protrusion are rounded.
According to an advantageous example of the invention the system is a crankshaft - counterweight system comprising a crankshaft and a counterweight, which are attached to each other by bolt joints, which comprise bolts located through bolt holes in the counterweight to threaded holes in the crankshaft so that a crankshaft - counterweight contact surface is formed, and on surface of the counterweight has been formed at least one, preferably two circular protrusion/^, which are formed as at least two circular segments around each bolt hole of the crankshaft. According to an advantageous feature at least one of the protrusions is located between the longitudinal end of the counterweight and the bolt hole and at least one other of the protrusions is located on opposed side of the bolt hole in respect to the other protrusion.
According to this advantageous example the crankshaft - counterweight system according to the invention comprises according to an advantageous aspect a crankshaft - counterweight contact surface, wherein shape of the con- tact surface is two segments around the bolt holes of the bolt joint of the crankshaft - counterweight system, wherein the area, which is below the fillet
of the main journal, is contactless, wherein the area close to the bolt holes is contactless and wherein the corners of the contact surface have rounded shape. This makes the contact pressure to distribute more evenly to whole contact surface. Main journal fillet degreases the stiffness at the corner of the contact surface. This is a contact area where fretting damage is very likely to occur due to low contact pressure. Threads close to contact surface causes contact pressure concentration around the bolt holes. When this area is not in contact the contact pressure is more evenly distributed to whole contact surface. Contact surface is formed from two segments around the bolt hole in- stead of ring because. This way possible fretting damage is avoided on the areas that have high tensile stress amplitude. Tensile stress amplitude enables the small cranks caused by fretting damage to grow. Rounded shape in the corners of the contact surface. Highest shear stresses due to counter weight vibrations occur in the corners of contact surfaces. With the rounded shape shear stress is more evenly distributed to the whole contact area.
In the following the invention is described in more detail by reference to the accompanying drawing in which in figure 1 is show schematically a simplified example of a crankshaft - counterweight contact surface according to prior art, in figure 2 is shown schematically a simplified example of locations of bolt holes on a crankshaft - counterweight contact surface according to an advantageous feature of the invention, in figure 3 is shown schematically a simplified example of a crankshaft - counterweight contact surface according to the invention and in figures 4A - 4C is shown schematically a simplified example of a part- part contact surface according to the invention.
During the course of the following description and in the figures 1 - 4C corresponding reference numbers are used to identify like elements, parts and part components unless otherwise mentioned. In the following the examples are described mainly by reference to a crankshaft - counterweight system and its contact surface in view of simplifying the disclosure but it should be noted that instead of this example any type of two part system having a corresponding
contact surface can have similar features and properties in accordance with the invention.
Figure 1 shows schematically a simplified example of a crankshaft - counterweight contact surface 12 (squared area) according to prior art on the coun- terweight 10 side. Each bolt hole 1 1 is located substantially centrally on the contact area. The contact area 12 is located around the corresponding bolt hole 1 1 extending to substantially whole area of the counterweight surface in cross direction and in longitudinal direction such that a square like surface is formed, when the area of the recess 13. Figure 2 shows schematically a simplified example of locations of bolt holes 21 on a crankshaft - counterweight contact surface 12 according to an advantageous feature. In figure 2 with dashed lines are indicated the locations of bolt holes 1 1 according to prior art. The location of the bolt hole 21 is moved slightly towards the center of the counterweight 10 in longitudinal direction and slightly away from the recess 23.
Figure 3 shows schematically a simplified example of a crankshaft - counterweight contact surface according to the invention. According to the invention protrusions 22A; 22B are formed as two segments around the bolt holes 21 . Thus the contact pressure is more evenly distributed over the whole contact surface. By the improved contact area the low contact pressure areas 31 at each end of the recess 23 are contactless and thus there is not contact in area which is below the fillet of the main journal, which were contact areas where fretting damage would very likely occur due to low contact pressure. Furthermore there is no contact around the bolt hole as the closest edge of the corre- sponding protrusions 22A; 22B forming the contact area is located at a distance from the edge of the bolt hole 21 next to it. When this area is not in contact the contact pressure is more evenly distributed to whole contact surface, as threads close to contact surface would cause contact pressure concentration around the bolt holes 21 . Neither is there contact in areas that have high tensile stress amplitude as the contact surface 22A; 22B is formed from the two segments around the bolt hole 21 instead of ring. This way possible fretting damage is avoided on these areas that have high tensile stress amplitude, since tensile stress amplitude would enable the small cranks caused by fretting damage to grow. According to an advantageous feature the protrusions 22A; 22B have rounded shape in the corners. Typically highest shear stresses due
to counter weight vibrations occur in the corners of contact surfaces. With the rounded shape shear stress is more evenly distributed to whole contact area.
As can be seen from figure 3 in the crankshaft - counterweight contact surface the surface of the counterweight, that will be opposed to the surface of the crankshaft, when bolts are located into bolt holes 21 and tightened, has two protrusions 22A, 22B next to each bolt hole 21 at a distance from the edge of the bolt hole 21 and at a circular distance from each other. One of which protrusions 22A is located between the longitudinal end of the counterweight and the bolt hole 21 and the other one on opposed side of the bolt hole 21 so that they are located space apart around the bolt hole 21 . Thus each contact surface is towards the crankshaft protruding circular segment with rounded corners and inclined edges.
In figures 4A - 4C is schematically shown a simplified example of a part- part (10, 12) contact surface according to the invention. According to the invention protrusions 22 are formed circularly on at least one 10 of the parts around the bolt hole 21 of the joint of the parts 10, 12. Thus the contact pressure is evenly distributed over the whole contact surface. Furthermore there is no contact around the bolt hole 21 as the closest edge of the corresponding protrusion 22 forming the contact area is located at a distance from the edge of the bolt hole 21 next to it. When this area is not in contact the contact pressure is more evenly distributed to whole contact surface, as threads close to contact surface would cause contact pressure concentration around the bolt holes 21 . According to an advantageous feature the protrusions 22 have rounded shape in the corners and inclined edges. Although the system has been described above by referring to a joint of a crankshaft and a counterweight, it can be used in many other applications as well such as bolt joints between the engine block and brackets for different parts to be joined to the engine, such as pumps, turbo chargers etc. Basically, the system can be applied to any two part system, where fretting phenomenon can occur.
Above only some advantageous examples of the invention have been described to which the invention is not to be narrowly limited. It is clear to one skilled in the art that many modifications and variations are possible with in the invention as defined in the following claims.
Reference signs used in the drawing 10 one part, f. ex. counterweight 12 another part
1 1 , 21 bolt hole
12 contact surface
13, 23 recess
22A, 22B protrusion
31 low contact pressure area
32 high tensile stress amplitude area L1 , L2 distance
Claims
System of to each other joinable two parts (10, 12), which parts (10, 12) are opposed to each other and joined to each other by at least one bolt joint comprising a bolt located through respective bolt hole such that part-part contact surface is formed, characterized in that on at least surface of one (10) of the parts (10, 12) is formed at least one circular protrusion (22; 22A, 22B) extending at least partially around the joint and that the at least one circular protrusion forms contact area of the part-part contact surface.
System according to claim 1 or 2, characterized in, that around each bolt hole (21 ) the corresponding circular protrusion (22; 22A, 22B) is located at a distance from the edge of the bolt hole (21 ).
System according to any of claims 1 - 2, characterized in, that each protrusion (22; 22A, 22B) on one part (10) is towards the opposed part (12) and upwards from the surface of the one part (10).
4. System according to any of claims 1 - 3, characterized in that the protrusion is formed as two protrusions (22A, 22B), which are located spaced apart around the bolt hole (21 ).
5. System according to any of claims 1 - 3, characterized in that the pro- trusion is formed as one protrusion (22) circumventing bolt hole (21 ).
6. System according to any of previous claims, characterized in that the contact area of the part-part contact surface formed by the protrusion/-s is defined based on the tightening force of the bolts.
7. System according to any of previous claims, characterized in that edges of the protrusion (22, 22A, 22B) are inclined.
8. System according to claim 4, characterized in that corners of the protrusion (22A, 22B) are rounded.
9. System according to claim 1 , which system is a crankshaft - counterweight system comprising a crankshaft and a counterweight (10), which are attached to each other by bolt joints, which comprise bolts located through bolt holes (21 ) in the counterweight to threaded holes in the crankshaft so that a crankshaft - counterweight contact surface is formed, characterized in that on surface of the counterweight (20) has been formed at least one, preferably two circular protrusion/-s (22A, 22B), which are formed as at least two circular segments around each bolt hole (21 ) of the crankshaft (10).
10. System according to claim 9, characterized in that at least one of the protrusions (22A) is located between the longitudinal end of the counterweight (10) and the bolt hole (21 ) and at least one other of the protrusions (22B) is located on opposed side of the bolt hole (21 ) in respect to the other protrusion (22A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FI2014/050660 WO2016030569A1 (en) | 2014-08-29 | 2014-08-29 | System to reduce the fretting in a bolt-joint (especially for a crankshaft-counterweight structure) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FI2014/050660 WO2016030569A1 (en) | 2014-08-29 | 2014-08-29 | System to reduce the fretting in a bolt-joint (especially for a crankshaft-counterweight structure) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2016030569A1 true WO2016030569A1 (en) | 2016-03-03 |
Family
ID=51582419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FI2014/050660 WO2016030569A1 (en) | 2014-08-29 | 2014-08-29 | System to reduce the fretting in a bolt-joint (especially for a crankshaft-counterweight structure) |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2016030569A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT520205B1 (en) * | 2017-09-15 | 2019-02-15 | Miba Sinter Austria Gmbh | bearing cap |
| DE102017119058A1 (en) * | 2017-08-21 | 2019-02-21 | Schunk Sintermetalltechnik Gmbh | Bearing cover and bearing arrangement |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1111877B (en) | 1958-01-22 | 1961-07-27 | Zentrale Entwicklung Veb | Device for damping torsional and bending vibrations on crankshafts with counterweight flexibly attached to the crankshaft or the cheek |
| DE1273900B (en) | 1959-10-31 | 1968-07-25 | Daimler Benz Ag | Detachable counterweight attachment to the crankshaft of internal combustion piston engines |
| DE3738717A1 (en) | 1986-11-28 | 1988-07-28 | Volkswagen Ag | Built-up crankshaft |
| WO1997042424A1 (en) * | 1996-05-03 | 1997-11-13 | Zenith Sintered Products, Inc. | Precisely repositionable bearing cap |
| US6471406B1 (en) * | 1996-05-03 | 2002-10-29 | Gkn Sinter Metals, Inc. | Side-bolt bearing caps |
| JP2014005859A (en) * | 2012-06-22 | 2014-01-16 | Ihi Corp | Coupling structure |
-
2014
- 2014-08-29 WO PCT/FI2014/050660 patent/WO2016030569A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1111877B (en) | 1958-01-22 | 1961-07-27 | Zentrale Entwicklung Veb | Device for damping torsional and bending vibrations on crankshafts with counterweight flexibly attached to the crankshaft or the cheek |
| DE1273900B (en) | 1959-10-31 | 1968-07-25 | Daimler Benz Ag | Detachable counterweight attachment to the crankshaft of internal combustion piston engines |
| DE3738717A1 (en) | 1986-11-28 | 1988-07-28 | Volkswagen Ag | Built-up crankshaft |
| WO1997042424A1 (en) * | 1996-05-03 | 1997-11-13 | Zenith Sintered Products, Inc. | Precisely repositionable bearing cap |
| US6471406B1 (en) * | 1996-05-03 | 2002-10-29 | Gkn Sinter Metals, Inc. | Side-bolt bearing caps |
| JP2014005859A (en) * | 2012-06-22 | 2014-01-16 | Ihi Corp | Coupling structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017119058A1 (en) * | 2017-08-21 | 2019-02-21 | Schunk Sintermetalltechnik Gmbh | Bearing cover and bearing arrangement |
| AT520205B1 (en) * | 2017-09-15 | 2019-02-15 | Miba Sinter Austria Gmbh | bearing cap |
| AT520205A4 (en) * | 2017-09-15 | 2019-02-15 | Miba Sinter Austria Gmbh | bearing cap |
| US10400816B2 (en) | 2017-09-15 | 2019-09-03 | Miba Sinter Austria Gmbh | Bearing cover |
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