THE EFFECT OF HEAT VARIATION ON DIFFERENT BRAKE DISK BRAKING FORCES

Abstract

In this study, two different ventilated brake discs were manufactured and their braking force performances and heat generations were investigated experimentally together with a solid disc. Braking force outputs were examined in sudden and continuous braking conditions and disc temperatures were simply measured in continuous braking conditions. Fourteen pedal forces were used in sudden braking tests and eight periodic measurements were executed in continuous braking tests. Experiment results showed that ventilation applications not only increased the brake force outputs up to 42.6 %, but also reduced the heat formation on discs up to 31.5 % depending on test conditions.

Keywords

• Ventilation, Braking force, Heat generation, Brake discs.

FARKLI FREN DİSKLERİNDE OLUŞAN ISI DEĞİŞİMİNİN FRENLEME KUVVETLERİNE ETKİLERİ

Öz

Bu çalışmada iki farklı soğutmalı fren diski üretilerek bunların normal fren diski ile frenleme performansları ve ısı oluşumları deneysel olarak incelenmiştir. Ani frenlemeler ile frenleme kuvvetleri ve sürekli frenleme şartlarında sıcaklıklar ölçülmüştür. On dört farklı pedal kuvvetinde ani frenleme testleri ve sekiz farklı frenleme şartlarında ise frenleme sıcaklıkları test edilmiştir. Test sonuçlarına göre hava soğutma uygulaması, frenleme kuvvetini % 42,6 artırmakla birlikte şartlara bağlı olarak oluşan ısıyı da % 31,5 azaltmaktadır.

Anahtar Kelimeler

• Hava ile soğutma, Frenleme kuvveti, Isı üretimi, Fren diski.

Kaynakça

1. Aleksendric, D. and Duboka, C. 2007. A neural model of automotive cold brake performance, FME Transactions. (35), 9-14.
2. Antanaitis, D. and Rifici, A. 2006. The effect of rotor crossdrilling on brake performance, SAE 2006- 01-0691. 571-596.
3. Brecht, J. 1998. Influence of material selection on stresses in ventilated brake discs, Textar GmbH, SAE Paper No: 980595.
4. Breuer, B. and Karlheinz H.B. 2008. Brake Technology Handbook, First English Edition, SAE International, Warrandale, Pennsylvania, USA..
5. Chatterley, T.C. and Macnaughtan, M.P. 1999. Cast Iron Brake Discs - Current Position, Performance and Future Trends in Europe. SAE 1999-01-0141, 23-33.
6. Hudson, M.D. and Ruhl, R.L. 1997. Ventilated Brake Rotor Air Flow Investigation, SAE Paper No: 971033.
7. Limpert, R. 1999. Brake Design and Safety, Second Edition, Society of Automotive Engineers, Inc. Warrendale. 140-143.
8. Patrick, G.S. 2002. An improved rotor for self- ventilating disc brakes, International Application Published Under The Patent Cooperation Treaty (PCT), WO 02/064992 A3.

9. Rooij, M.B. and Schipper, D.J. 1998. A wear measurement method based on the comparison of local surface heights, Wear. 217, 182-189.
10. Vries, A. and Wagner, M. 1992. The Brake Judder Phenomenon, SAE Paper No: 920554.
11. Zuber, C. and Heidenreich, B. 2006. Development of a Net Shape Manufacturing Mehod for Ventilated Brake Discs in Single Piece Design, Mat.-wiss. U. Werkstofftech. 37 (4), 301-308.