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핀부트 홀 직경 축소와 브레이크 래틀노이즈의 상관 관계 분석
윤보람,전경훈,김용희,변문환 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.10
Caliper rattle noise is mostly caused by vibrations applied to the wheel when the vehicle drives on an unpaved road or a paved road with continuous steps. This can be attributed to loosely fitted components, such as rubber or spring in the caliper. In this paper, we studied the relationship between reducing the size of the pin-boot hole and the brake rattle noise of a two-piston floating caliper. After analyzing the sound sources of the rattle noise, we controlled the tightening force of the pin-boot to improve rattle noise characteristics. This was achieved by reducing the diameter of the pin-boot seating hole in the torque member. The results of our study showed a high correlation between the reduction of the pin-boot seating hole and improvement in rattle noise, as the caliper body and the torque member can vibrate under a more integrated condition. However, as an adverse effect, caliper sliding resistance may increase, leading to high drag and accelerating pad wear. Thus, we are proposing an optimal improvement design range after considering the trade-off relationship between caliper rattle noise and sliding resistance.
윤보람(Boram Yoon),최연국(Yeon Guk Choi),변문환(Mun Hwan Byoun) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Brake caliper is a critical component that applies braking force by pressing pistons against the brake disc. While caliper is primarily designed for functionality, external coating and design are also considered for caliper appearance. Caliper cover is an accessory that can be attached to the caliper to enhance its external appearance independent of caliper function. This cover is made of lightweight materials and designed with various colors and lettering. The attachment method and potential interference with other caliper components should be carefully considered to ensure proper assembly and attachment strength for caliper cover. In this paper, we study about caliper cover attachment method using rubber bush which offers advantages compared to other attachment methods. Caliper cover design is developed with consideration for aluminum die-casting productivity and avoiding interference with other caliper components. Assembly, detachment force and vibration durability tests are conducted using four combinations of caliper body and caliper cover samples. Through these test results, we confirmed the feasibility and effectiveness of the rubber bush attachment method for caliper cover.