pleuel

专利摘要:
Connecting rod (1), comprising a connecting rod (2) and a connecting rod cover, wherein the connecting rod (2) and the connecting rod cover are detachably connectable to each other by fastening means and in the connected state a connecting rod eye comprising a bore (6) to the connecting rod (1) to be attached to a crankshaft, and wherein the connecting rod (2) and connecting rod cover contact surfaces (7), along which the connecting rod (2) and connecting rod cover in the connected state and the contact surfaces (7) partially interlocking teeth (8), wherein the Contact surfaces (7) have an untoothed portion (9). The contact surface (7) has at least one undercut (10), at which no contact of connecting rod (2) and connecting rod cover takes place, wherein the at least one undercut (10) between the toothing (8) and the untoothed portion (9) is formed ,
公开号:AT517878A1
申请号:T50950/2015
申请日:2015-11-06
公开日:2017-05-15
发明作者:Bussieres Frederic
申请人:Ge Jenbacher Gmbh & Co Og；
IPC主号:

专利说明:

The invention relates to a connecting rod for an internal combustion engine having the features of the preamble of claim 1.
A connecting rod (short: connecting rod) converts translational movements of a piston into rotarische movements of a crankshaft. In reciprocating engines, for example, while the translational movement of the piston is converted into a rotating movement. So each piston is connected by a connecting rod with the crankshaft. Other applications find connecting rods in pumps and the like.
The connecting rod has a small connecting rod eye, via which the connecting rod is connected via a piston pin to the piston of the reciprocating engine. The small connecting rod opposite and connected by the connecting rod shaft, the connecting rod, also called large connecting rod eye.
The connecting rod is often split for mounting on the crankshaft. The connecting rod detachable part of the connecting rod is referred to as a connecting rod cover and is usually connected via a screw connection with the connecting rod shank. The dividing plane may be normal to the longitudinal direction of the connecting rod shaft, but it may also be an oblique pitch of the connecting rod head may be required to facilitate the installation and removal of the connecting rod via a cylinder of the reciprocating engine.
At the contact surface, high lateral forces occur, which can be better controlled by a toothing. Bruchtrennpleuel are also known, in which the contact surfaces are produced by a brittle fracture of the large connecting rod eye. Bruchtrennpleuel are not included in the scope of the invention.
US 2003/0131683 A1 shows a connecting rod with different interlocking teeth of the contact surfaces between the connecting rod cap and the connecting rod stem.
When toothed connecting rods has proved to be disadvantageous that it comes in the area of the toothing, especially in the vicinity of the fastener, by which connecting rod and connecting rod cover is compressed, to voltage peaks. Such local voltage spikes can be a cause of breakage of the big connecting rod fatigue fracture. This characteristic of splined connecting rods worsens increasingly with an increase in the eccentricity of the attachment. When the fastener position is moved to the center of the bore, the eccentricity of the joint increases the stress spikes and increases the likelihood of component failure.
The object of the invention is therefore to provide a connecting rod with a uniform distribution of stress in the contact surfaces between the connecting rod and connecting rod cover and specify a connecting rod cover that minimizes voltage spikes in conjunction with an eccentricity of the toothed and screw connection.
The object is achieved by a connecting rod having the features of claim 1. Advantageous embodiments are specified in the dependent claims.
In this context, it has been found that by using untoothed sections, the stresses in the contact surface can be reduced.
It can preferably be provided that the untoothed section extends at the contact surface towards the bore, preferably adjoins the bore.
The untoothed portion may be substantially planar.
It can be provided that the contact surface has at least one undercut on which no contact takes place of the connecting rod and connecting rod cover. In connection with the present application under undercut is a
To understand interruption of the contact surface. By using an undercut, the stresses at the base of the toothing can be reduced.
It can preferably be provided that the undercut - preferably directly - passes into the untoothed section. This is to be understood that preferably a direct transition of the undercut is provided in the toothing.
It may be preferred that the undercut is located farther from the bore than the untoothed portion. In other words, the toothed portion between the bore for receiving the crankshaft and the undercut is arranged.
It can be provided that the attachment means of the connecting rod and connecting rod cover are formed by screws, which can be performed through holes for receiving fasteners, and wherein the undercut is arranged in the region of at least one bore for receiving fastening means. This arrangement offers particular advantages in terms of the voltage distribution at the contact surface.
The undercut may, for example, have width which corresponds approximately to half of a wavelength of the toothing.
The following advantages are achieved by the invention in particular: Homogeneous distribution of the surface pressure between the contact surfaces with a uniform load distribution over the entire contact surface, for example, when the untoothed portion is carried out by a "plateau", - reduction of the pressure and lateral force (which caused by the assembly and operation) on the plateau and the gearing, - reduction of the principal stresses at the root of the gearing by means of an "undercut".
This can be achieved with otherwise unchanged dimensions of the connecting rod increased safety factors against high-cycle fatigue and plastic deformation.
The invention is explained in more detail below by the figures. Showing:
1a to 1c details of a connecting rod,
Fig. 2a to 2c details of a toothed portion of the contact surface
Fig. 1a shows a section of a connecting rod shaft 2 of a connecting rod 1 in a perspective view according to a first embodiment. Via bores 12 for receiving a fastening means 4, a connecting rod cover 3, not shown, can be connected to the connecting rod shaft 2.
The connecting rod shaft 2 has contact surfaces 7, which are in the assembled state in engagement with corresponding contact surfaces 7 of the connecting rod cover 3, not shown. For the sake of simplicity, the representation is restricted to only one contact surface 7, but it is of course also possible to provide several.
The contact surface 7 has a toothing to receive translational forces over the separation surface.
However, the toothing 8 causes in the through the holes 12 for receiving the fastener 4 reduced cross-section of the contact surfaces 7, a voltage increase, especially at the roots of the toothing 8. This voltage overshoot can cause a plastic material deformation in these areas of the teeth and triggering a fatigue fracture ( high cycle fatigue fracture). On the edge of the bore for receiving the fastening means 12 thereby act very high cyclic loads.
In split connecting rods fastening means 4 are arranged as close to the bore 6 for receiving the crankshaft 13. This prevents the contact surfaces 7 from lifting apart from one another by the forces acting on the bore 6 and a bending stress being applied to the fastening means 4.
According to the invention, the contact surface 7 has an untoothed section 9.
In the present embodiment, the bores 12 for receiving a fastening means 4 are completely in the toothed section 8. In the direction of a bore 6, in which in the assembled state connecting rod shaft 2 and connecting rod 3 can enclose a crankshaft 13, not shown, the toothed portion 8 of a non-toothed Section 9 limited.
In Fig. 1b, the detail A of Fig. 1a is shown in more detail. The longitudinal axis of the bore 12 for receiving the fastening means 4 may be located at different positions of the contact surface 7. Shown is the variant in which the bore 12 lies completely in the toothed region 8 and the untoothed region 9 adjoins the bore 12. The toothing of the toothed region 8 runs straight and parallel to the longitudinal axis of the bore 6.
In the embodiment according to FIG. 1c, however, the toothing of the toothed region 8 is curved. Although the toothing of the toothed area 8 runs evenly (ie within the dividing plane of the connecting rod 1), the toothing has a curvature which facilitates centering of the connecting rod cover 3 (not shown) when mounted on the connecting rod shaft 2. In contrast to the embodiment previously shown, the holes 12 for receiving the fastener 4 are approximately halfway in the toothed area 8 and in the untoothed area 9. Of course, the position of the holes 12 can be varied within the contact surface 7 at a connecting rod with a curved extending toothing , The depth t of the untoothed portion 9 can be chosen differently. Typically, the depth t is smaller than two wavelengths p 'of the toothing 8. By varying the depth t, different aspect ratios of the untoothed section 9 result.
By means of an embodiment of the contact surfaces 7 explained on the basis of the exemplary embodiments 1a to 1c, a significantly reduced stress intensity in the region of the contact surface at its portion facing the bore 6 is ascertained.
2a to 2c show further embodiments of the contact surface 7. FIG. 2a shows a cross section through contact surfaces 7 in the assembled state of a connecting rod 1. As already explained, the contact surfaces 7 have a toothed section 8. In the exemplary embodiment according to FIG. 2 a, an undercut 10 lies between the toothed region 8 and the untoothed region 9. The width b of the undercut 10 is, for example, half the wavelength p 'of the toothing 8. The untoothed section 9 narrows in the present exemplary embodiment in relation to FIG Bore 6 with the opening angle Θ. A slightly oblique course of the untoothed portion 9 may be provided, for example, to increase the pressure on a back of a bore 6 can be introduced into the bearing, or for example, to ensure contact of the contact surfaces 7 despite manufacturing tolerances, or for example, a certain pressure profile within set the contact surfaces 7.
Fig. 2b shows a detail of the embodiment of the untoothed portion 9. The untoothed portion 9 need not consist of flat surface portions, but the opposite portions of the contact surfaces 7 may have a radius of curvature R. In this way it is possible to define a contact point despite manufacturing tolerances and / or to set a specific pressure profile within the untoothed portion 9.
The width p of the undercut 10 can be designed so that a certain degree of stress reduction is achieved. The length t of the untoothed portion may differ from the width p of the undercut 10.
Fig. 2c illustrates another constructive detail of the undercut 10. Thus, the undercut 10 can be formed with different radii η, Γ2. The profile of the undercut 10 does not necessarily have to follow a circular curve.
List of reference numbers used. 1 Connecting rod 2 Connecting rod shaft 3 Connecting rod cover 4 Fastening means 5 Connecting rod eye 6 Bore for receiving crankshaft 7 Contact surface 8 Gearing 9 Non-serrated section 10 Undercut 11 Bolt 12 Bore for mounting fastener 13 Crankshaft p Width of undercut p 'Wavelength of toothing r Radius of curvature
Innsbruck, 31 March 2016

权利要求:
Claims (8)
[1]
claims
1. connecting rod (1), comprising a connecting rod (2) and a connecting rod cover (3), - wherein the connecting rod (2) and the connecting rod cover (3) by fastening means (4) are detachably connectable to each other and in the connected state, a connecting rod (5 ) comprising a bore (6) to attach the connecting rod (1) to a crankshaft (13) and - wherein the connecting rod (2) and connecting rod cover (3) contact surfaces (7), along which connecting rod (2) and connecting rod cover ( 3) in the connected state and the contact surfaces (7) have in sections an interlocking toothing (8), characterized in that the contact surfaces (7) have an untoothed portion (9).
[2]
2. connecting rod according to claim 1, wherein the untoothed portion (9) extends to the contact surface (7) towards the bore (6), preferably to the bore (6) connects.
[3]
3. Connecting rod according to claim 1 or 2, wherein the untoothed portion (9) is substantially planar.
[4]
4. connecting rod according to at least one of the preceding claims, wherein the contact surface (7) has at least one undercut (10), at which no contact of the connecting rod (2) and connecting rod cover (3) takes place.
[5]
5. connecting rod according to claim 4, wherein the undercut (10) - preferably immediately -in the untoothed portion (9) passes.
[6]
A connecting rod according to at least one of claims 4 or 5, wherein the undercut (10) is located farther from the bore (6) than the untoothed portion (8).
[7]
7. connecting rod according to at least one of claims 4 to 6, wherein the fastening means (4) of the connecting rod (2) and connecting rod cover (3) by screws (11) are formed, which can be performed through holes for receiving fastening means (12), and wherein the undercut (10) in the region of the at least one bore for receiving fastening means (12) is arranged.
[8]
8. connecting rod according to at least one of claims 4 to 7, wherein the undercut (10) has a width (p) which corresponds approximately to half a wavelength of the toothing (8).

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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ATA50950/2015A|AT517878B1|2015-11-06|2015-11-06|pleuel|ATA50950/2015A| AT517878B1|2015-11-06|2015-11-06|pleuel|

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EP16794979.1A| EP3371469B1|2015-11-06|2016-11-07|Connecting rod|

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PCT/EP2016/076816| WO2017077108A1|2015-11-06|2016-11-07|Connecting rod|

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US15/773,189| US10876571B2|2015-11-06|2016-11-07|Connecting rod|

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CN201680064656.7A| CN108350926B|2015-11-06|2016-11-07|Connecting rod|

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CA3004162A| CA3004162A1|2015-11-06|2016-11-07|Connecting rod|