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Journal bearing housing design
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2007 (English)In: TRIBOLOGY INTERNATIONAL, 2007, p. 665-671Conference paper, Published paper (Refereed)
Abstract [en]

When designing journal bearing housings for construction equipment, one goal is to get an even pressure distribution over the length of the bushing. This is to avoid excessive wear due to contact pressure peaks.

A housing that is considered good, does not allow the pin to deflect and keeps the stresses low in the weld. To do this it must be stiff and this will lead to high contact pressures on the edges of the bushing, which is not preferable since wear is highly dependent on the contact pressure level.

If the distribution of the contact pressure could be smoothed out over the bushing, the material might be used more efficiently. The normal way to do this is to crown the bushing to allow for pin deflection. However this leads to reduced area in contact. Another method to avoid high pressures in the bearing is to optimize the bearing housing for optimum stiffness.

This paper describes one way to optimize journal bearing housings in regard to the contact pressure in the tribo-contact. A statistical approach was applied to a parameterized finite element model with contact elements. Three parameters were analyzed at different loads; set ring thickness, set ring width and fillet weld size.

The contact pressure distributions were evaluated in two different ways to a single value to meet the statistical demand of measurable result. The results show that the set ring thickness and width are the parameters that influence most the contact pressure distribution. To reduce the maximum contact pressure the set ring thickness should be kept small.

Place, publisher, year, edition, pages
2007. p. 665-671
Series
Tribology international, ISSN 0301-679X
Keyword [en]
contact pressure, FEM, journal bearing
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:kth:diva-6832DOI: 10.1016/j.triboint.2005.11.018ISI: 000243576700016OAI: oai:DiVA.org:kth-6832DiVA, id: diva2:11652
Conference
11th Nordic Symposium on Tribology NORWAY, JUN 01-03, 2004
Note
QC 20100930Available from: 2005-09-27 Created: 2005-09-27 Last updated: 2010-09-30Bibliographically approved
In thesis
1. Design, testing and analysis of journal bearings for construction equipment
Open this publication in new window or tab >>Design, testing and analysis of journal bearings for construction equipment
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Grease-lubricated journal bearings present a common challenge for construction equipment manufacturers in the world. The common design methodology is based on empirical data and has worked very well historically because the market and governments have accepted that bearings in construction equipment need frequent lubrication and exchange of worn parts. Legal and market requirements will soon demand lower environmental impact and increased machine efficiency. These requirements call for better methods of designing grease lubricated journal bearings.

The goal of the outlined work was to develop better design methods for grease lubricated journal-bearing design used in heavy-duty construction equipment machines, in order to prolong life and lubrication intervals.

The research approach of the project can roughly be divided into three phases:

1. Development of test apparatus and test methods for journal bearing studies.

2. Bench tests of grease lubricated journal bearing design.

3. Verification between bench tests and computer simulations.

In the thesis the current state of the art in bearing design for construction equipment is discussed and summarized in the form of design guidelines. The suggested design steps are just a mean to get to the starting point of design. The simple guidelines do however serve a purpose when collected since most published bearing design guidelines are aimed at the bushing material or at continuously rotating bearings. The influence of housing, environment and load cases can not be ignored when designing a bearing. Long term field-testing and experience can not be replaced until better design criteria have been established.

Paper A deals with the design of the bearing test apparatus that was built and evaluated. Comparisons between theoretical contact and contact elements in Finite Element program have been made and discussed in paper B. In paper C a replica technique for measuring wear of large field specimens was evaluated. A case study of bearing housing design was performed in paper D utilizing Finite Element program and then validated in paper E in the bearing test apparatus. The influence of grease groove design on bushing life was tested and evaluated in paper F. Wear simulation of a plain bushing has been performed with a Finite Element program and presented in paper G.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. p. xiv, 42
Series
Trita-MMK, ISSN 1400-1179 ; 2005:21
Keyword
Contact Mechanics, Finite Element, Grease, Journal Bearing, Lubrication, Replica Technique, Test Apparatus, Tribology, Wear
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:kth:diva-429 (URN)91-7178-142-0 (ISBN)
Public defence
2005-10-07, Sal M3, Brinellvägen 64, Stockholm, 14:15
Opponent
Supervisors
Note
QC 20100930Available from: 2005-09-27 Created: 2005-09-27 Last updated: 2010-09-30Bibliographically approved

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