KS Gleitlager GmbH

Bahnhof Löhne, Germany

KS Gleitlager GmbH

Bahnhof Löhne, Germany
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Patent
KS Gleitlager GmbH | Date: 2017-01-04

The invention relates to a plain bearing shell (2), having a substantially semicylindrical geometry, for use in a piston (50) of a radial piston engine for the purposes of mounting a roller or shaft, having an axial direction (4), a radial direction (6) and a circumferential direction (8) of the plain bearing shell, having two face sides (10, 12) which face away from one another in the axial direction (4), having a radially outer side (14) and a radially inner side (16) which faces toward the roller or shaft and which receives said roller or shaft such that it can slide in the circumferential direction (8); it is proposed according to the invention that, on at least one face side (10, 12), there is provided a projection (18) which protrudes in the axial direction (4) of the plain bearing shell and which serves to form a means for preventing rotation in the circumferential direction (8).


Allmaier H.,Virtual Vehicle Research Center | Sander D.E.,Virtual Vehicle Research Center | Priebsch H.H.,Virtual Vehicle Research Center | Witt M.,KS Gleitlager GmbH | And 2 more authors.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology | Year: 2016

For the study of mixed lubrication in dynamically loaded journal bearings, this paper employs a combined experimental and simulative approach. Extensive measurements on a journal bearing test rig with a low-viscosity 0W20 multi-grade lubricant with a strong Non-Newtonian behaviour provide the basis for the investigation of the lubrication conditions in journal bearings. In this paper, temperature effects and the influence of running-in (breaking-in) wear are investigated. To this task, a high dynamic load is applied to the journal bearing under test. To vary the lubrication conditions, only the journal speed is changed. To investigate the lubrication conditions a detailed and validated simulation approach is utilized that takes into account both the piezoviscous effect and the non-Newtonian behaviour of the investigated lubricant as well is able to describe metal-metal contact. With this combined approach the run-in process of the journal bearing under test can be investigated as well as the role of temperature settling effects. © 2015 Institution of Mechanical Engineers.


Sander D.E.,Virtual Vehicle Research Center | Allmaier H.,Virtual Vehicle Research Center | Priebsch H.H.,Virtual Vehicle Research Center | Witt M.,KS Gleitlager GmbH | Skiadas A.,KS Gleitlager GmbH
Tribology International | Year: 2016

This paper focuses on the friction behavior of journal bearings operating from hydrodynamic to mixed lubrication regime where severe metal-metal contact occurs. Therefore, friction tests with two different static loads are carried out on the journal bearing test-rig from KS Gleitlager. The test results in the form of Stribeck curves provide a solid base to proof the isothermal elastohydrodynamic simulation approach. The simulation approach solves the averaged Reynolds equation introduced by Patir and Cheng and considers metal-metal contact by using the Greenwood and Tripp contact model. All necessary surface parameters are derived from surface scans. No less essential in this approach are the experimentally identified lubricant properties under high pressure and high shear rate. The calculated friction torque matches the measurement results within the measurement uncertainty for a wide range of operation conditions. With the validated simulation approach the influence of surface smoothing due to metal-metal contact is discussed. Additionally, the limits of a constant boundary coefficient are identified and the effects of flow factors are presented. © 2015 Elsevier Ltd. All rights reserved.


Sander D.E.,Virtual Vehicle Research Center | Allmaier H.,Virtual Vehicle Research Center | Priebsch H.H.,Virtual Vehicle Research Center | Reich F.M.,Virtual Vehicle Research Center | And 5 more authors.
Tribology International | Year: 2015

For the study of mixed lubrication in journal bearings, this paper employs a combined experimental and simulative approach. Extensive measurements on a journal bearing test rig with a low viscosity 0W20 multi-grade lubricant provide a solid basis which is complemented by experimental lubricant data that is measured under high pressure and high shear rates. In this paper, this data is used to investigate the impact of the piezoviscous effect and the non-Newtonian lubricant properties on the friction power losses in journal bearings over a wide range of dynamic loads and shaft speeds. In particular, this work seeks to predict the friction power losses for journal bearings under both moderate (50 MPa peak load) and high dynamic loads (100 MPa peak load) using the recently presented accurate numerical method (Allmaier et al., 2011 [1], Allmaier et al., 2013 [2]). From the direct comparison to the experimental data a key finding is that the simulation conforms very closely to the measured data. To be more exact, the agreement lies within the measurement uncertainty. Following this result, the influence of the often neglected piezoviscous effect and the non-Newtonian lubricant rheology is investigated. We conclude that both the piezoviscous effect and the non-Newtonian behaviour are essential to describe the lubrication with multi-grade lubricants in journal bearings. Only the consideration of both properties describes the experimental data very accurately over the entire range of operating conditions studied. © 2014 Elsevier Ltd. All rights reserved.


Sander D.E.,Virtual Vehicle Research Center | Allmaier H.,Virtual Vehicle Research Center | Priebsch H.H.,Virtual Vehicle Research Center | Reich F.M.,Virtual Vehicle Research Center | And 3 more authors.
Tribology International | Year: 2015

Abstract This paper focuses on the beginning phase of hydrodynamic journal bearing life time when the first adaption of the contacting surfaces occurs. Generally, this effect is known as running-in. Experimental data from a journal bearing test rig using a low viscosity 0W20 multi-grade automotive lubricant provide the solid basis for the simulative study of the running-in process. From these measurements and a subsequent determination of the surface roughness, parameters for the mixed lubrication contact model are derived. This analysis combined with the experimentally identified lubricant properties under high pressure and high shear rate enables the evaluation of an iterative simulation approach. In this iterative approach the bearing surface geometry is adapted stepwise until a steady state of operation is achieved. Results show worn regions at the edge of the highly loaded bearing shell. This wear is caused by metal-metal contact due to the elastic bending of the shaft. The calculated wear depth at the edge and the expansion of the worn area in axial and circumferential direction matches the measured profile. This agreement indicates that the simple iterative approach using the Greenwood and Tripp contact model and Archard's wear equation is suitable to predict the worn surface geometry after the running-in process is completed. Furthermore, the simulation shows that the maximum asperity contact pressure in mixed lubrication decreases with the stepwise adaption of the surface geometry, until only an insignificant metal-metal contact remains. With this adapted surface geometry, the influence of shaft speed, temperature and surface roughness is also discussed. © 2015 Elsevier Ltd.


Taipalus R.,KS Gleitlager GmbH | Pasternak A.,KS Gleitlager GmbH | Reinicke R.,KS Gleitlager GmbH
Tribologie und Schmierungstechnik | Year: 2012

In general an increasingly higher performance is required for plain bearings. At the same time efficient fillers such as lead are eliminated by the EUDirectives on End-of-Life vehicles. This was the initiation to develop new lead-free, low-maintenance bearing materials. For the KS P200-Serie the substitution of lead was successfully realized and even better tribological properties were achieved. Responsible for the good properties of the new KS P200-Serie is the combination of special fillers in a high performing PVDF-Matrix.


Patent
KS Gleitlager GmbH | Date: 2013-04-30

A plain bearing composite material (2), has a supporting layer (4), optionally a porous substrate layer (6), in particular made of bronze, and a sliding layer material (8) made of a matrix-forming thermoplastic plastic material (10) and fillers (12) accommodated therein, wherein the sliding layer material (8) has a fraction of 1-40 vol % wollastonite as a mineral filler (14) and at least half of the wollastonite is present with needle-shaped modification.


Patent
KS gleitlager GMbH | Date: 2015-02-25

The invention relates to a plain bearing shell (2), having a substantially semicylindrical geometry, for use in a piston (50) of a radial piston engine for the purposes of mounting a roller or shaft, having an axial direction (4), a radial direction (6) and a circumferential direction (8) of the plain bearing shell, having two face sides (10, 12) which face away from one another in the axial direction (4), having a radially outer side (14) and a radially inner side (16) which faces toward the roller or shaft and which receives said roller or shaft such that it can slide in the circumferential direction (8); it is proposed according to the invention that, on at least one face side (10, 12), there is provided a projection (18) which protrudes in the axial direction (4) of the plain bearing shell and which serves to form a means for preventing rotation in the circumferential direction (8).


A metal/plastic slide bearing composite material (2) has a metallic support layer (4), especially of steel, and a porous carrier layer (6), especially a carrier layer (6) applied by sintering from metallic particles (7). A polymer-based slide layer material (8) completely fills the pores of the carrier layer (6) and has fillers that improve the tribological properties. The polymer basis is PTFE. The sliding layer material (8) has 0.1-5% by mass of carbon nanotubes with an external tube diameter of <80 nm and a tube length of <20 m.


A metallic composite material for a sliding bearing (2) has a metallic support layer (4), in particular steel, and a bearing metal layer (6) based on copper-tin with 2-6 wt. % tin. The bearing metal layer (6) has 0.2-2 wt. % nickel. A sliding bearing element, which is to be used in or close to the motor, can be produced from this type of sliding bearing composite material (2).

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